Natural Product: NPC521167

Natural Product IDNPC521167
Common Name
?
The InCHIKey will be temporarily assigned as the "Common Name" if no IUPAC name or alternative short name is available.
GAMA-TOCOPHEROL
IUPAC Name (2~{S})-2,7,8-trimethyl-2-[(4~{S},8~{R})-4,8,12-trimethyltridecyl]chroman-6-ol
Synonyms
Synthetic Gene Cluster n.a.
ChEMBL Identifier n.a.
PubChem CID n.a.
Chemical Classification
  • CHEMONTID:0000000 [Organic compounds]

The Chemical Classification was calculated by Classyfire, a software for chemical taxonomy calculation. Reference: DOI:10.1186/s13321-016-0174-y.

  Chemical Representations

Standard InCHIKey QUEDXNHFTDJVIY-WENCSYSZSA-N
Standard InCHI InChI=1S/C28H48O2/c1-20(2)11-8-12-21(3)13-9-14-22(4)15-10-17-28(7)18-16-25-19-26(29)23(5)24(6)27(25)30-28/h19-22,29H,8-18H2,1-7H3/t21-,22+,28+/m1/s1
SMILES CC1=C(O)C=C2CC[C@](C)(CCC[C@@H](C)CCC[C@H](C)CCCC(C)C)OC2=C1C

  Calculated Properties

Physi-Chem Properties

Molecular Weight:   416.37 Volume:   485.402
?
Van der Waals volume.
Dense:   0.858 LogP:   9.15
?
The logarithm of the n-octanol/water distribution coefficients.
logD7.4:   5.513
?
The logarithm of the n-octanol/water distribution coefficient at pH=7.4.
LogS:   -7.847
?
The logarithm of aqueous solubility value.
Rotatable Bonds:   12.0 Rigid Bonds:   11.0
TPSA:   29.46
?
Topological Polar Surface Area.
H-Bond Acceptor:   2.0
H-Bond Donor:   1.0 Rings:   2.0
Heavy Atoms:   2.0

MedChem Properties

QED Drug-Likeness Score:   0.37 GASA:   0.0
?
GASA represents the probability of being difficult to synthesize, ranging from 0 to 1.
Synthetic Accessibility Score:   3.786 Fsp3:   0.786
MCE-18:   53.04
?
MCE-18 stands for medicinal chemistry evolution.MCE-18≥45 is considered a suitable value.
Lipinski Rule-of-5:   Rejected
Pfizer Rule:   Accepted GSK Rule:   Accepted
Golden Triangle Rule:   Accepted BMS Rule:   1
Chelating Alert:   0 PAINS Alert:   0
Colloidal aggregators:   0.929 Fluc inhibitor:   0.279
?
The fluc inhibitor value is the probability of being fLuc inhibitors, within the range of 0 to 1.
Blue fluorescence:   0.013
?
The blue fluorescence value is the probability of being blue fluorescence, within the range of 0 to 1
Green fluorescence:   0.05
?
The green fluorescence value is the probability of being green fluorescence, within the range of 0 to 1
Reactive compounds:   0.509 Promiscuous compounds:   0.028

ADMET Properties (ADMETlab3.0)

ADMET: Absorption

Caco-2 Permeability:   -5.016 MDCK Permeability:   -4.704
Pgp-inhibitor:   0.0 Pgp-substrate:   0.002
PAMPA:   0.024
?
The experimental data for Peff was logarithmically transformed (logPeff). Molecules with log Peff values below 2.0 were classified as low-permeability (Category 0), while those with log Peff values exceeding 2.5 were classified as high-permeability (Category 1).
Human Intestinal Absorption (HIA):   0.0
20% Bioavailability (F20%):   0.011 30% Bioavailability (F30%):   0.676
50% Bioavailability (F50%):   0.984

ADMET: Distribution

Blood-Brain-Barrier Penetration (BBB):   0.996 MRP1:   0.976
Plasma Protein Binding (PPB):   93.32% Volume Distribution (VD):   0.244
Fu: 7.633%
?
The fraction unbound in plasms.
OATP1B1 inhibitor:   1.0
OATP1B3 inhibitor:   1.0 BCRP inhibitor:   0.097
BSEP inhibitor:   0.005

ADMET: Metabolism

CYP1A2-inhibitor:   0.001 CYP1A2-substrate:   1.0
CYP2C19-inhibitor:   1.0 CYP2C19-substrate:   1.0
CYP2C9-inhibitor:   0.442 CYP2C9-substrate:   0.086
CYP2D6-inhibitor:   0.025 CYP2D6-substrate:   0.732
CYP3A4-inhibitor:   0.986 CYP3A4-substrate:   1.0
CYP2B6-substrate:   0.001 CYP2C8-inhibitor:   1.0
HLM stability:   0.999
?
Human liver microsomal (HLM) stability. Category 0: stable+ (HLM > 30 min); Category 1: unstable- (HLM ≤ 30 min). The output value is the probability of human liver microsomal instability, where a value closer to 1 indicates a higher likelihood of instability.

ADMET: Excretion

Clearance (CL):  4.307 Half-life (T1/2):  0.547

ADMET: Toxicity

hERG Blockers:  0.332 hERG Blockers (10um):  0.723
Human Hepatotoxicity (H-HT):  0.724 Drug-induced Liver Injury (DILI):  0.019
AMES Toxicity:  0.321 Rat Oral Acute Toxicity:  0.19
Maximum Recommended Daily Dose:  0.165 Skin Sensitization:  0.999
Carcinogencity:  0.631 Eye Corrosion:  0.716
Eye Irritation:  0.975 Respiratory Toxicity:  0.788
Drug-induced Neurotoxicity:  0.016 Ototoxicity:  0.529
Hematotoxicity:  0.192 Drug-induced Nephrotoxicity:  0.264
Genotoxicity:  0.0 RPMI-8226 Immunitoxicity:  0.126
A549 Cytotoxicity:  0.811 Hek293 Cytotoxicity:  0.244
BCF:   2.358
?
Bioconcentration factors are used for considering secondary poisoning potential and assessing risks to human health via the food chain. The unit is -log10[(mg/L)/(1000*MW)].
IGC50:   5.606
?
48 hour Tetrahymena pyriformis IGC50. The unit of IGC50 is -log10[(mg/L)/(1000*MW)].
LC50DM:   6.797
?
48 hour Daphnia magna LC50. The unit of LC50DM is -log10[(mg/L)/(1000*MW)].
LC50FM:   7.099
?
96 hour fathead minnow LC50. The unit of LC50FM is -log10[(mg/L)/(1000*MW)].

  Species Source

Organism ID Organism Name Taxonomy Level Family SuperKingdom Isolation Part Collection Location Collection Time Reference
NPO21349 Punica granatum Species Lythraceae Eukaryota n.a. fruit n.a. DOI[10.1007/s00217-007-0799-1]
NPO21349 Punica granatum Species Lythraceae Eukaryota n.a. flower n.a. DOI[10.1016/j.foodchem.2011.01.077]
NPO19866 Arabidopsis thaliana Species Brassicaceae Eukaryota n.a. n.a. n.a. DOI[10.1016/S0014-5793(03)00033-4]
NPO19866 Arabidopsis thaliana Species Brassicaceae Eukaryota n.a. n.a. n.a. DOI[10.1021/ac991142i]
NPO19866 Arabidopsis thaliana Species Brassicaceae Eukaryota n.a. n.a. n.a. DOI[10.1034/j.1399-3054.2003.00030.x]
NPO19866 Arabidopsis thaliana Species Brassicaceae Eukaryota n.a. n.a. n.a. DOI[10.1046/j.1365-3040.2001.00686.x]
NPO19866 Arabidopsis thaliana Species Brassicaceae Eukaryota n.a. n.a. n.a. DOI[10.1074/jbc.274.1.397]
NPO19866 Arabidopsis thaliana Species Brassicaceae Eukaryota n.a. n.a. n.a. DOI[10.1074/jbc.M302362200]
NPO19866 Arabidopsis thaliana Species Brassicaceae Eukaryota n.a. n.a. n.a. DOI[10.1074/jbc.M314195200]
NPO19866 Arabidopsis thaliana Species Brassicaceae Eukaryota n.a. n.a. n.a. DOI[10.1074/jbc.M411109200]
NPO19866 Arabidopsis thaliana Species Brassicaceae Eukaryota n.a. n.a. n.a. DOI[10.1104/pp.103.022368]
NPO19866 Arabidopsis thaliana Species Brassicaceae Eukaryota n.a. leaf n.a. PMID[10952545]
NPO19866 Arabidopsis thaliana Species Brassicaceae Eukaryota n.a. n.a. n.a. PMID[10952545]
NPO19866 Arabidopsis thaliana Species Brassicaceae Eukaryota n.a. n.a. n.a. PMID[11005203]
NPO21349 Punica granatum Species Lythraceae Eukaryota n.a. n.a. n.a. PMID[11520216]
NPO19866 Arabidopsis thaliana Species Brassicaceae Eukaryota n.a. n.a. n.a. PMID[12637544]
NPO19866 Arabidopsis thaliana Species Brassicaceae Eukaryota n.a. n.a. n.a. PMID[12805618]
NPO19866 Arabidopsis thaliana Species Brassicaceae Eukaryota n.a. n.a. n.a. PMID[14745019]
NPO19866 Arabidopsis thaliana Species Brassicaceae Eukaryota n.a. n.a. n.a. PMID[15280363]
NPO21349 Punica granatum Species Lythraceae Eukaryota Seeds n.a. n.a. PMID[15620261]
NPO19866 Arabidopsis thaliana Species Brassicaceae Eukaryota n.a. n.a. n.a. PMID[15820655]
NPO19866 Arabidopsis thaliana Species Brassicaceae Eukaryota n.a. n.a. n.a. PMID[15834012]
NPO19866 Arabidopsis thaliana Species Brassicaceae Eukaryota aerial parts n.a. n.a. PMID[15844959]
NPO19866 Arabidopsis thaliana Species Brassicaceae Eukaryota n.a. n.a. n.a. PMID[1684022]
NPO19866 Arabidopsis thaliana Species Brassicaceae Eukaryota n.a. n.a. n.a. PMID[17611796]
NPO19866 Arabidopsis thaliana Species Brassicaceae Eukaryota n.a. n.a. n.a. PMID[18057039]
NPO19866 Arabidopsis thaliana Species Brassicaceae Eukaryota n.a. n.a. n.a. PMID[18235971]
NPO19866 Arabidopsis thaliana Species Brassicaceae Eukaryota n.a. n.a. n.a. PMID[18318836]
NPO19866 Arabidopsis thaliana Species Brassicaceae Eukaryota n.a. leaf n.a. PMID[19521717]
NPO19866 Arabidopsis thaliana Species Brassicaceae Eukaryota n.a. n.a. n.a. PMID[21193570]
NPO19866 Arabidopsis thaliana Species Brassicaceae Eukaryota n.a. n.a. n.a. PMID[21194489]
NPO19866 Arabidopsis thaliana Species Brassicaceae Eukaryota n.a. n.a. n.a. PMID[21395888]
NPO19866 Arabidopsis thaliana Species Brassicaceae Eukaryota n.a. n.a. n.a. PMID[21800258]
NPO19866 Arabidopsis thaliana Species Brassicaceae Eukaryota n.a. n.a. n.a. PMID[23370715]
NPO19866 Arabidopsis thaliana Species Brassicaceae Eukaryota n.a. n.a. n.a. PMID[23950498]
NPO19866 Arabidopsis thaliana Species Brassicaceae Eukaryota n.a. root n.a. PMID[24163311]
NPO19866 Arabidopsis thaliana Species Brassicaceae Eukaryota n.a. n.a. n.a. PMID[24285094]
NPO19866 Arabidopsis thaliana Species Brassicaceae Eukaryota n.a. root n.a. PMID[25457500]
NPO19866 Arabidopsis thaliana Species Brassicaceae Eukaryota n.a. root n.a. PMID[27363486]
NPO19866 Arabidopsis thaliana Species Brassicaceae Eukaryota n.a. n.a. n.a. PMID[27432888]
NPO21349 Punica granatum Species Lythraceae Eukaryota n.a. n.a. n.a. PMID[36560643]
NPO21349 Punica granatum Species Lythraceae Eukaryota n.a. n.a. n.a. PMID[39138188]
NPO21349 Punica granatum Species Lythraceae Eukaryota n.a. n.a. n.a. PMID[39527985]
NPO19866 Arabidopsis thaliana Species Brassicaceae Eukaryota n.a. n.a. n.a. PMID[8278506]
NPO19866 Arabidopsis thaliana Species Brassicaceae Eukaryota n.a. n.a. n.a. Database[Article]
NPO45500 Rosmarinus officinalis L. Genus Lamiaceae Eukaryota n.a. n.a. n.a. Database[COCONUT]
NPO47500 Delphinium ajacis L. Genus Ranunculaceae Eukaryota n.a. n.a. n.a. Database[COCONUT]
NPO50284 Elaeis guineensis Jacq. Genus Arecaceae Eukaryota n.a. n.a. n.a. Database[COCONUT]
NPO19866 Arabidopsis thaliana Species Brassicaceae Eukaryota n.a. n.a. n.a. Database[COCONUT]
NPO993 Phaseolus coccineus Species Fabaceae Eukaryota n.a. n.a. n.a. Database[COCONUT]
NPO21349 Punica granatum Species Lythraceae Eukaryota n.a. n.a. n.a. Database[COCONUT]
NPO43780 Coriandrum sativum L. Genus Apiaceae Eukaryota n.a. n.a. n.a. Database[COCONUT]
NPO54537 Nicotiana tabacum L. Genus Solanaceae Eukaryota n.a. n.a. n.a. Database[COCONUT]
NPO50353 Bixa orellana L. Genus Bixaceae Eukaryota n.a. n.a. n.a. Database[COCONUT]
NPO44442 Oryza sativa L. Genus Poaceae Eukaryota n.a. n.a. n.a. Database[COCONUT]
NPO43508 Carum carvi L. Genus Apiaceae Eukaryota n.a. n.a. n.a. Database[COCONUT]
NPO46843 Calophyllum inophyllum L. Genus Calophyllaceae Eukaryota n.a. n.a. n.a. Database[COCONUT]
NPO53457 Gevuina avellana Mol. Genus Proteaceae Eukaryota n.a. n.a. n.a. Database[COCONUT]
NPO57885 Zea mays L. Genus Poaceae Eukaryota n.a. n.a. n.a. Database[COCONUT]
NPO56140 Aesculus hippocastanum Hort. Genus Sapindaceae Eukaryota n.a. n.a. n.a. Database[COCONUT]
NPO46802 Amaranthus hypochondriacus L. Genus Amaranthaceae Eukaryota n.a. n.a. n.a. Database[COCONUT]
NPO51793 Avena sativa L. Genus Poaceae Eukaryota n.a. n.a. n.a. Database[COCONUT]
NPO60041 Cocos nucifera L. Genus Arecaceae Eukaryota n.a. n.a. n.a. Database[COCONUT]
NPO43635 Litchi chinensis Sonn. Genus Sapindaceae Eukaryota n.a. n.a. n.a. Database[COCONUT]
NPO57580 Juglans regia L. Genus Juglandaceae Eukaryota n.a. n.a. n.a. Database[COCONUT]
NPO51497 Vitis vinifera L. Genus Vitaceae Eukaryota n.a. n.a. n.a. Database[COCONUT]
NPO61721 Vaccinium macrocarpon Aiton Genus Ericaceae Eukaryota n.a. n.a. n.a. Database[COCONUT]
NPO63328 Foeniculum vulgare L. Genus Apiaceae Eukaryota n.a. n.a. n.a. Database[COCONUT]
NPO56122 Hordeum vulgare L. Genus Poaceae Eukaryota n.a. n.a. n.a. Database[COCONUT]
NPO47968 Hevea brasiliensis Mull.Arg. Genus Euphorbiaceae Eukaryota n.a. n.a. n.a. Database[COCONUT]
NPO21349 Punica granatum Species Lythraceae Eukaryota n.a. n.a. Database[FooDB]
NPO21349 Punica granatum Species Lythraceae Eukaryota n.a. n.a. Database[FooDB]
NPO993 Phaseolus coccineus Species Fabaceae Eukaryota n.a. n.a. Database[FooDB]
NPO21349 Punica granatum Species Lythraceae Eukaryota Twig n.a. n.a. Database[FooDB]
NPO21349 Punica granatum Species Lythraceae Eukaryota Stem Bark n.a. n.a. Database[FooDB]
NPO993 Phaseolus coccineus Species Fabaceae Eukaryota Seed n.a. n.a. Database[FooDB]
NPO21349 Punica granatum Species Lythraceae Eukaryota Seed n.a. n.a. Database[FooDB]
NPO21349 Punica granatum Species Lythraceae Eukaryota Root Bark n.a. n.a. Database[FooDB]
NPO21349 Punica granatum Species Lythraceae Eukaryota Pericarp n.a. n.a. Database[FooDB]
NPO993 Phaseolus coccineus Species Fabaceae Eukaryota Leaf Diffusate n.a. n.a. Database[FooDB]
NPO21349 Punica granatum Species Lythraceae Eukaryota Leaf n.a. n.a. Database[FooDB]
NPO993 Phaseolus coccineus Species Fabaceae Eukaryota Fruit n.a. n.a. Database[FooDB]
NPO21349 Punica granatum Species Lythraceae Eukaryota Fruit n.a. n.a. Database[FooDB]
NPO21349 Punica granatum Species Lythraceae Eukaryota Bark n.a. n.a. Database[FooDB]
NPO21349 Punica granatum Species Lythraceae Eukaryota n.a. n.a. n.a. Database[HerDing]
NPO19866 Arabidopsis thaliana Species Brassicaceae Eukaryota n.a. root n.a. Database[MetaboLights]
NPO19866 Arabidopsis thaliana Species Brassicaceae Eukaryota n.a. n.a. n.a. Database[MetaboLights]
NPO21349 Punica granatum Species Lythraceae Eukaryota n.a. n.a. Database[Phenol-Explorer]
NPO21349 Punica granatum Species Lythraceae Eukaryota Fruits n.a. Database[Phenol-Explorer]
NPO993 Phaseolus coccineus Species Fabaceae Eukaryota n.a. n.a. n.a. Database[TCMID]
NPO21349 Punica granatum Species Lythraceae Eukaryota n.a. n.a. n.a. Database[TCMID]
NPO21349 Punica granatum Species Lythraceae Eukaryota n.a. n.a. n.a. Database[TCM_Taiwan]
NPO21349 Punica granatum Species Lythraceae Eukaryota n.a. n.a. n.a. Database[TM-MC]
NPO993 Phaseolus coccineus Species Fabaceae Eukaryota n.a. n.a. n.a. Database[UNPD]
NPO19866 Arabidopsis thaliana Species Brassicaceae Eukaryota n.a. n.a. n.a. Database[UNPD]
NPO21349 Punica granatum Species Lythraceae Eukaryota n.a. n.a. n.a. Database[UNPD]

Note for Reference:
In addition to directly collecting NP source organism data from primary literature (where reference will provided as NCBI PMID or DOI links), NPASS also integrated them from below databases:
UNPD: Universal Natural Products Database [PMID: 23638153].
StreptomeDB: a database of streptomycetes natural products [PMID: 33051671].
TM-MC: a database of medicinal materials and chemical compounds in Northeast Asian traditional medicine [PMID: 26156871].
TCM@Taiwan: a Traditional Chinese Medicine database [PMID: 21253603].
TCMID: a Traditional Chinese Medicine database [PMID: 29106634].
TCMSP: The traditional Chinese medicine systems pharmacology database and analysis platform [PMID: 24735618].
HerDing: a herb recommendation system to treat diseases using genes and chemicals [PMID: 26980517].
MetaboLights: a metabolomics database [PMID: 27010336].
FooDB: a database of constituents, chemistry and biology of food species [www.foodb.ca].



  NP Quantity Composition/Concentration

Organism ID Organism Name Organism Material Preparation Organism Part NP Quantity (Standard) NP Quantity (Minimum) NP Quantity (Maximum) Quantity Unit Reference

Note for Reference:
In addition to directly collecting NP quantitative data from primary literature (where reference will provided as NCBI PMID or DOI links), NPASS also integrated NP quantitative records for specific NP domains (e.g., NPS from foods or herbs) from domain-specific databases. These databases include:
DUKE: Dr. Duke's Phytochemical and Ethnobotanical Databases.
PHENOL EXPLORER: is the first comprehensive database on polyphenol content in foods [PMID: 24103452], its homepage can be accessed at here.
FooDB: a database of constituents, chemistry and biology of food species [www.foodb.ca].



 Biological Activity

Molecular-level activity

Target ID Target Type Target Name Target Organism Activity Type Activity Relation Value Unit Reference

In vitro activity

Target ID Target Type Target Name Target Organism Activity Type Activity Relation Value Unit Reference

In vivo activity

Target ID Target Type Target Name Target Organism Activity Type Activity Relation Value Unit Reference





 Experimental ADME

Experiment Model Experiment Tissue ADME Type ADME Relation ADME Value ADME Unit Reference





 Experimental Toxicity

Quantitative toxicity

Experiment Model Experiment Organism Toxicity Type Toxicity Relation Toxicity Value Toxicity Unit Reference

Common Abbreviations:
LC: Lethal Concentration; LD: Lethal Dose; LT:Lethal Time; NOAEL: No-observed-adverse-effect Level; BMDL: Benchmark Dose Lower Confidence Limit; BMD: Benchmark Dose; BMC:Benchmark Concentration; LOAEL: Lowest Observed Adverse Effect Level; RfD:Reference Dose; RfC:Reference Concentration; MRL: Minimal Risk Level; MEG: Maximum Exposure Guideline; PAC: Protective Action Criteria

Categorical toxicity labels

Hepatotoxicity Carcinogenicity Mutagenicity Cardiotoxicity Respiratory Toxicity Eye Irritation Endocrine Disruption
Hepatotoxicity Carcinogenicity Mutagenicity Cardiotoxicity Respiratory Toxicity Eye Irritation Endocrine Disruption

Note for Reference:
In addition to directly collecting NP quantitative data from primary literature (where reference will provided as NCBI PMID or DOI links), NPASS also integrated NP toxicity records from domain-specific databases. These databases include:
ToxValDB: a curated database that compiles quantitative toxicity values for chemicals from diverse public sources to support toxicological research and risk assessment.
TOXRIC: a comprehensive, free-to-access, online database providing toxicological/feature data. The toxicity labels are retrieved from this database. [PMID: 36400569]


  Chemically structural similarity

Similar Active Natural Products in NPASS

Top-200 similar NPs were calculated against the active-NP-set (includes approximately 50,000 NPs with experimentally-derived bioactivity available in NPASS)

Similarity is measured using the Tanimoto coefficient (Tc) , which compares the binary fingerprints of two molecules. Tc is calculated as the intersection divided by the union of '1' bits in the fingerprints, ranging from 0 to 1, with 1 indicating highest similarity.

●  The left chart: Distribution of similarity level between NPC521167 and all remaining natural products in the NPASS database.
●  The right table: Most similar natural products (Tc>=0.5 or Top200).

Similarity Score Similarity Level Natural Product ID
1.0 High Similarity NPC48623
1.0 High Similarity NPC168707
0.7222 Intermediate Similarity NPC187993
0.7222 Intermediate Similarity NPC238176
0.6852 Remote Similarity NPC126759
0.6852 Remote Similarity NPC242580
0.6852 Remote Similarity NPC236070
0.5902 Remote Similarity NPC45663
0.5517 Remote Similarity NPC238075
0.507 Remote Similarity NPC609806

Similar Clinical/Approved Drugs

Similarity level is defined by Tanimoto coefficient (Tc) between two molecules.

●  The left chart: Distribution of similarity level between NPC521167 and all drugs/candidates.
●  The right table: Most similar clinical/approved drugs (Tc>=0.5 or Top200).

Similarity Score Similarity Level Drug ID Developmental Stage
0.6852 Remote Similarity NPD7340 Approved
0.5517 Remote Similarity NPD7644 Approved

Bioactivity similarity

  Bioactivity similarity

Similar Natural Products in NPASS

Similarity level is defined by Bioactivity similarity was calculated based on bioactivity descriptors of compounds. The bioactivity descriptors were calculated by a recently developed AI algorithm Chemical Checker (CC) [Nature Biotechnology, 38:1087–1096, 2020; Nature Communications, 12:3932, 2021], which evaluated bioactivity similarities at five levels:
A: chemistry similarity;
B: biological targets similarity;
C: networks similarity;
D: cell-based bioactivity similarity;
E: similarity based on clinical data.
Those 5 categories of CC bioactivity descriptors were calculated and then subjected to manifold projection using UMAP algorithm, to project all NPs on a 2-Dimensional space. The current NP was highlighted with a small circle in the 2-D map. Below figures: left-to-right, A-to-E.

A: chemistry similarity
B: biological targets similarity
C: networks similarity
D: cell-based bioactivity similarity
E: similarity based on clinical data