## Endpoint to Predict
- Endpoint scope: assay
- Measurement type: IC50
- Label type: continuous
- Binary semantics: pchembl
- Assay description: FAAH, CB1, and CB2 Inhibition Assay: The ability of the compounds according to some embodiments of the present invention to inhibit a radiolabeled cannabinoid ligand, CP-55,940, [Side chain-2,3,4(N)-3H(N)]-(Perkin-Elmer Cat. # NET1051) to either the human CB1 receptor or CB2 receptor was determined according to the manufacturer's instructions in the commercially available membrane preparations from Perkin Elmer (Cat Nos. RBHCB1M400UA and RBXCB2M400UA). Briefly, pre-treatment of the glass fiber membrane of a Matrix 96 well GFC filtration microtiter plate was done in order to help reduce non-specific binding of the radioligand to the GFC membrane. This was done by adding 150 μl of 0.5% polyethylimine (PEI) to each well and letting this remain in the plate for at least 4 hours before using it to terminate the binding reaction. The actual binding reaction was performed in a polypropylene (PP) round bottom 96-well microtiter plate. Briefly, 55 μl of assay buffer (50 mM TRIS pH7.4, 2.5 mM EGTA, 5 mM MgCl2, 120 mM NaCl, 0.1% Fatty acid free BSA) was added to each well, followed by 20 μl of a 0.4 mg/ml CB1 or CB2 membrane suspension (8 μg membrane per well). To initiate the reaction, 20 μl of 5 nM 3H CP-55,940 (1 nM final concentration) was added to each well. Nonspecific binding was defined in the presence of 20 μM unlabeled WIN 55212 (Sigma cat. W-102). ACEA was routinely used as a positive control for both assays. The plate was shaken on an orbital plate shaker and the binding reaction proceeded until equilibrium was reached after 3 hours at room temperature. Using a Multiscreen vacuum manifold, the PEI was filtered through the GFC filter plate. The binding reaction in the PP plate was mixed by aspirating the reaction contents of each well and dispensing back into the plate. This was repeated 4 times and then 75 μl of the reaction mixture was transferred to the GFC plate. This procedure could be done row by row with the use of a multichannel pipette, or all at once if using automation. Once the entire content of the PP plate was transferred to the GFC plate, the binding reactions were terminated by filtering thru the GFC plate. The filter plate was then washed by adding 100 μl ice-cold wash buffer 50 mM TRIS pH 7.4, 2.5 mM EGTA, 5 mM MgCl2, 120 mM NaCl, 2% Fatty acid free BSA) to each well and filtering through.
- Assay organism: Homo sapiens
- Target name: Cannabinoid receptor 1
- Target type: SINGLE PROTEIN
- Target organism: Homo sapiens

## Reference Molecule A
- Canonical SMILES: CCCCCC/C=C/C=C/CCCCCCCC(=O)NC(CC(=O)O)Cc1c[nH]cn1
- Properties:
- ChEMBL ID: CHEMBL5749317
- Molecular weight: 431.62
- Heavy atoms: 31
- Hydrogen bond donors: 3
- Hydrogen bond acceptors: 3
- TPSA: 95.08
- LogP: 5.73
- Rotatable bonds: 19
- Ring count: 1
- Aromatic rings: 1
- Formal charge: 0
- Fraction Csp3: 0.64
- QED: 0.19

## Known Reference Result on This Endpoint
- Molecule A clean result: median pChEMBL = 4.33
- This result is provided as context for predicting Molecule B on the same endpoint.

## Reference Molecule A Other ChEMBL Evidence
- type IC50; relation =; value 47000; units nM; pChEMBL 4.33; comment 1119832

## Query Molecule B
- Canonical SMILES: CCCCC/C=C\C=C\CCCCCCCCC(=O)NCCC(=O)O
- Properties:
- ChEMBL ID: CHEMBL5822541
- Molecular weight: 351.53
- Heavy atoms: 25
- Hydrogen bond donors: 2
- Hydrogen bond acceptors: 2
- TPSA: 66.4
- LogP: 5.39
- Rotatable bonds: 17
- Ring count: 0
- Aromatic rings: 0
- Formal charge: 0
- Fraction Csp3: 0.71
- QED: 0.27

## Molecule Similarity
- Weighted Tanimoto: 0.46

Answer: 4.66