## Endpoint to Predict
- Endpoint scope: assay
- Measurement type: IC50
- Label type: continuous
- Binary semantics: pchembl
- Assay description: HTRF-Based Assay: Methods for V79-Human-CYP11B2 and V79-Human-CYP11B1 Assays: 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-hCYP11B1-8CLC7, 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).
- Assay organism: Homo sapiens
- Target name: Cytochrome P450 11B1, mitochondrial
- Target type: SINGLE PROTEIN
- Target organism: Homo sapiens

## Reference Molecule A
- Canonical SMILES: CCc1c(-c2cncc(C)c2)nn2c1N(C)C(=O)CC2
- Properties:
- ChEMBL ID: CHEMBL3936160
- Molecule type: Small molecule
- Molecular weight: 270.34
- Heavy atoms: 20
- Hydrogen bond donors: 0
- Hydrogen bond acceptors: 3
- TPSA: 51.02
- LogP: 2.18
- Rotatable bonds: 2
- Ring count: 3
- Aromatic rings: 2
- Formal charge: 0
- Fraction Csp3: 0.4
- QED: 0.84

## Known Reference Result on This Endpoint
- Molecule A clean result: median pChEMBL = 5.63
- This result is provided as context for predicting Molecule B on the same endpoint.

## Reference Molecule A Other ChEMBL Evidence
- type IC50; relation =; value 2344; units nM; pChEMBL 5.63; comment 717778

## Query Molecule B
- Canonical SMILES: Cc1cncc(-c2nn3c(c2C)NC(=O)CC3)c1
- Properties:
- ChEMBL ID: CHEMBL3983243
- Molecule type: Small molecule
- Molecular weight: 242.28
- Heavy atoms: 18
- Hydrogen bond donors: 1
- Hydrogen bond acceptors: 3
- TPSA: 59.81
- LogP: 1.9
- Rotatable bonds: 1
- Ring count: 3
- Aromatic rings: 2
- Formal charge: 0
- Fraction Csp3: 0.31
- QED: 0.83

## Molecule Similarity
- Weighted Tanimoto: 0.5

Answer: 6.55