## Endpoint to Predict
- Endpoint scope: assay
- Measurement type: IC50
- Label type: continuous
- Binary semantics: pchembl
- Assay description: Binding Assay: The binding assays were performed by testing the ability of the new compounds to displace the radiolabeled synthetic non-selective cannabinoid agonist [3H]CP55940 (168 Ci/mmol; PerkinElmer) from the human CB1 (hCB1) or human CB2 (hCB2) receptors on membranes derived from stably transfected HEK-293 cells (PerkinElmer). Membranes were diluted in assay buffer (50 mM Tris-HCl, 1 mM EDTA, 1 mM MgCl2, 1 mg/ml BSA, pH=7.4). The amount of membrane was determined for each batch of membranes according to protein binding assay. The minimum amount of membrane that gave 50% specific binding was used for the binding assay. In most assays, binding was tested using 8 μg and 4 μg protein of hCB1 and hCB2 membranes, respectively. The tested compounds were dissolved in DMSO and diluted in assay buffer to a final concentration of 0.1% solvent. Total binding of [3H]CP55940 was evaluated with 1.5 nM to hCB1 and with 0.5 nM to hCB2, according to Kd affinity of [3H]CP55940 for the respective membranes. The ability of the tested compounds to displace [3H]CP55940 was evaluated first at a single concentration point of 100 nM for binding toward hCB2 or hCB1. In certain cases, the displacement was tested at compound concentrations ranging from 0.03 nM to 10 μM. Non-specific binding was measured by the addition of 1 μM of unlabelled CP55940 to the tubes. Binding assays were performed in triplicate in a total volume of 500 μl for 60 minutes at 30° C., in a shaking bath. Free and bound radioligands were separated by rapid filtration through GF/C filter plates (PerkinElmer) that had been presoaked with 0.1% Polyethylenimine (Sigma). Filters were shaken for 1 hour in 7 ml scintillation fluid (PerkinElmer) and radioactivity was determined by liquid scintillation counter (Wallac; PerkinElmer).
- Assay organism: Homo sapiens
- Assay cell type: HEK293
- Target name: Cannabinoid receptor 1
- Target type: SINGLE PROTEIN
- Target organism: Homo sapiens

## Reference Molecule A
- Canonical SMILES: O=S(=O)(NCC1CCOCC1)c1ccc(Nc2ccc(Cl)cc2Cl)cc1C(F)(F)F
- Properties:
- ChEMBL ID: CHEMBL3969620
- Molecule type: Small molecule
- Molecular weight: 483.34
- Heavy atoms: 30
- Hydrogen bond donors: 2
- Hydrogen bond acceptors: 4
- TPSA: 67.43
- LogP: 5.46
- Rotatable bonds: 6
- Ring count: 3
- Aromatic rings: 2
- Formal charge: 0
- Fraction Csp3: 0.37
- QED: 0.57

## Known Reference Result on This Endpoint
- Molecule A clean result: median pChEMBL = 4.86
- This result is provided as context for predicting Molecule B on the same endpoint.

## Reference Molecule A Other ChEMBL Evidence
- type IC50; relation =; value 13810; units nM; pChEMBL 4.86; comment 422743

## Query Molecule B
- Canonical SMILES: O=S(=O)(NCC1CCCO1)c1ccc(NC2CC3CCC2C3)cc1C(F)(F)F
- Properties:
- ChEMBL ID: CHEMBL3964524
- Molecule type: Small molecule
- Molecular weight: 418.48
- Heavy atoms: 28
- Hydrogen bond donors: 2
- Hydrogen bond acceptors: 4
- TPSA: 67.43
- LogP: 3.76
- Rotatable bonds: 6
- Ring count: 4
- Aromatic rings: 1
- Formal charge: 0
- Fraction Csp3: 0.68
- QED: 0.74

## Molecule Similarity
- Weighted Tanimoto: 0.43

Answer: 5.42