## Endpoint to Predict
- Endpoint scope: assay
- Measurement type: IC50
- Label type: continuous
- Binary semantics: pchembl
- Assay description: Heat-Based Assay: CHO cells stably expressing human TRPV1 (hTRPV1) were used. Functional assessment of heat-induced activation of hTRPV1 was carried out in a cell-based Ca2+ flux assay using ABI7500 Fast Real-Time PCR System as described in Reubish et al., "Functional assessment of temperature-gated ion-channel activity using a real-time PCR machine," www.BioTechniques.com 47(3):iii-ix (2009), which is hereby incorporated by reference. Briefly, hTRPV1/CHO cells were cultured in growth media in a tissue culture dish at 37° C. in a CO2 incubator. On the day of the assay, culture media were removed and the cells were then detached using 0.05% trypsin at 37° C. with 5% CO2, for 90 s. The detached cells were centrifuged (1000 rpm, 4 min) to remove trypsin-containing supernatant and resuspended in assay buffer (115 mM NaCl, 5.4 mM KCl, 0.8 mM MgCl2.6H2O, 1.8 mM CaCl2.2H2O, 13.8 mM D-glucose, and 20 mM HEPES). Then, the cells were loaded with 5 μM Fluo-4, a Ca2+ reporter dye, in the presence of 2.5 mM probenecid at 37° C. with 5% CO2, for 45 min. Thereafter, the cells were washed twice with measuring buffer (assay buffer supplemented with 0.1% BSA and 3.2 mM CaCl2) then transferred to a Fast 96-well Reaction Plate (0.1 mL) (Part no. 4346907, MICROAMP, Applied Biosystems, Foster City, Calif.). The cell density was 100,000 cells/24 μL/well. A solution of the compound under test (6 μL/well) was added into each well of the 96-well plate. Thus, the reaction volume per well was 30 μL. The plates were then placed inside an ABI7500 Fast Real-Time PCR instrument (Applied Biosystems) to read fluorescence at different temperatures using 7500 software, version 2.2 (Applied Biosystems). The initial temperature was set at 25° C. for 1 min. followed by a temperature ramp to 45° C. in 100 s to deliver heat to cells.
- Assay organism: Homo sapiens
- Assay cell type: CHO
- Target name: Transient receptor potential cation channel subfamily V member 1
- Target type: SINGLE PROTEIN
- Target organism: Homo sapiens

## Reference Molecule A
- Canonical SMILES: Cc1ccc2nc(NC(=O)c3ccc(-c4ncc(C[C@@H](O)CO)cc4F)cc3)sc2c1
- Properties:
- ChEMBL ID: CHEMBL4109130
- Molecule type: Small molecule
- Molecular weight: 437.5
- Heavy atoms: 31
- Hydrogen bond donors: 3
- Hydrogen bond acceptors: 6
- TPSA: 95.34
- LogP: 3.95
- Rotatable bonds: 6
- Ring count: 4
- Aromatic rings: 4
- Formal charge: 0
- Fraction Csp3: 0.17
- QED: 0.42

## Known Reference Result on This Endpoint
- Molecule A clean result: median pChEMBL = 6.06
- This result is provided as context for predicting Molecule B on the same endpoint.

## Reference Molecule A Other ChEMBL Evidence
- type IC50; relation =; value 879; units nM; pChEMBL 6.06; comment 415377

## Query Molecule B
- Canonical SMILES: O=C(Nc1nc2ccccc2s1)c1ccc(-c2ncc(C[C@@H](O)CO)cc2F)cc1
- Properties:
- ChEMBL ID: CHEMBL4112938
- Molecule type: Small molecule
- Molecular weight: 423.47
- Heavy atoms: 30
- Hydrogen bond donors: 3
- Hydrogen bond acceptors: 6
- TPSA: 95.34
- LogP: 3.65
- Rotatable bonds: 6
- Ring count: 4
- Aromatic rings: 4
- Formal charge: 0
- Fraction Csp3: 0.14
- QED: 0.44

## Molecule Similarity
- Weighted Tanimoto: 0.83

Answer: 6.51