## Endpoint to Predict
- Endpoint scope: assay
- Measurement type: IC50
- Label type: continuous
- Binary semantics: pchembl
- Assay description: Inhibition Assay: V79 cell lines stably expressing the either the human CYP11B2 or the human CYP11B1 enzyme were generated using a standard transfection protocol. V79 cells were transfected with plasmids pTriEx3-Hygro-hCyp11B2 or pTriEx3-Hygro-hCyp11B1 using Lipofectamine2000 reagent. V79 cells that stably express the human CYP11B2 or human CYP11B1 enzyme were selected for and maintained in DMEM supplemented with 10% FBS and 400 μg/mL hygromycin for ¿2 weeks. Single cell clones were generated by infinite dilution in DMEM supplemented with 10% FBS and 400 μg/mL hygromycin until single colonies were obtained. Clones V79-hCYP11B2-CLE9 and V79-hCYP11B1-CL8C7, were determined to produce the most aldosterone and cortisol, respectively, and were selected for inhibitor screening. For testing of inhibitors, cells were harvested at 80% confluency with 0.5% Trypsan-EDTA, washed once in PBS, and reconstituted in DMEM+0.1% BSA media at a cell concentration of 600,000 cells/mL for the CYP11B2 assay and 280,000 cells/mL for the CYP11B1 assay. 25 μL of cells were added to a 384 well tissue culture treated plate and mixed with 0.3 μL of inhibitor or DMSO (1% final DMSO concentration) for 1 hour at 37° C., 5% CO2. After pre-incubation with inhibitor, the reaction was initiated by adding 5 μL of substrate (final concentration of 125 nM 11-deoxycorticosterone for the CYP11B2 assay or 250 nM 11-deoxycortisol for the CYP11B1 assay). The reaction was carried out for 3 hours at 37° C., 5% CO2 and was stopped by harvesting the supernatants. The amount of product in the supernatant (aldosterone for CYP11B2 assay and cortisol for the CYP11B1 assay) was measured using HTRF-based assay kit (Aldosterone HTRF-CisBio#64ALDPEB, Cortisol HTRF-CisBio #63IDC002-CORT). IC50s for the inhibitor were determined by plotting the amount of product formed against the concentration of inhibitor using sigmoidal dose-response curve (variable slope) fit in GraphPad.
- Assay organism: Homo sapiens
- Target name: Cytochrome P450 11B1, mitochondrial
- Target type: SINGLE PROTEIN
- Target organism: Homo sapiens

## Reference Molecule A
- Canonical SMILES: CC(O)(c1cncc(-c2nc3ccc(F)cn3c2C2CC2)c1)C(F)(F)F
- Properties:
- ChEMBL ID: CHEMBL5963514
- Molecular weight: 365.33
- Heavy atoms: 26
- Hydrogen bond donors: 1
- Hydrogen bond acceptors: 3
- TPSA: 50.42
- LogP: 4.18
- Rotatable bonds: 3
- Ring count: 4
- Aromatic rings: 3
- Formal charge: 0
- Fraction Csp3: 0.33
- QED: 0.71

## Known Reference Result on This Endpoint
- Molecule A clean result: median pChEMBL = 5.95
- This result is provided as context for predicting Molecule B on the same endpoint.

## Reference Molecule A Other ChEMBL Evidence
- type IC50; relation =; value 1122; units nM; pChEMBL 5.95; comment 546023

## Query Molecule B
- Canonical SMILES: COc1cncc(-c2nc3ccc(F)cn3c2C)c1
- Properties:
- ChEMBL ID: CHEMBL5890150
- Molecular weight: 257.27
- Heavy atoms: 19
- Hydrogen bond donors: 0
- Hydrogen bond acceptors: 3
- TPSA: 39.42
- LogP: 2.85
- Rotatable bonds: 2
- Ring count: 3
- Aromatic rings: 3
- Formal charge: 0
- Fraction Csp3: 0.14
- QED: 0.71

## Molecule Similarity
- Weighted Tanimoto: 0.44

Answer: 7.49