## Endpoint to Predict
- Endpoint scope: assay
- Measurement type: IC50
- Label type: continuous
- Binary semantics: pchembl
- Assay description: Functional Assay: The assay was performed as described below, using HEK293 cells transfected with rat TRPV1 (rTRPV1/HEK293). These cells had a geneticin selection marker and were grown in Dulbecco's Modified Eagle Medium (DMEM, Gibco BRL) supplemented with 10% fetal bovine serum, penicillin/streptomycin (50 units/mL), and 500 μg/mL geneticin in 5% CO2 at 37° C. Cells were passaged frequently, every 3-5 days, to avoid overgrowth, depletion of essential medium components, or acidic medium exposure. Cells were passaged using a brief wash in 0.05% trypsin with 1 mM EDTA, followed by dissociation in divalent-free phosphate-buffered saline (Hyclone #SH328.02). Dissociated cells were seeded onto poly-D-lysine coated black-walled 96-well plates (Biocoat; Becton Dickinson #354640) at about 40,000 cells per well and grown for approximately 1 day in culture medium to near confluency. The assay buffer was composed of 130 mM NaCl, 2 mM KCl, 2 mM MgCl2, 10 mM HEPES, 5 mM glucose, and either 2 mM or 20 μM CaCl2. On the day of the experiment, the culture medium was replaced with 2 mM calcium assay buffer using an automated plate washer (ELx405; Biotek, VT). The cells were incubated in 100 μL/well Fluo-3/AM (2 μM; TEFLabs #0116) with Pluronic F127 (100 μg/mL; Sigma #P2443) for 1 h at rt in the dark. After loading the cells, the dye solution was replaced with 50 μL/well of 20 μM calcium assay buffer using the ELx405 plate washer. Test compounds (50 μL/well) were added to the plate and incubated for 30 min. Intracellular Ca2+ levels were subsequently assayed using a Fluorometric Imaging Plate Reader (FLIPR™ instrument, Molecular Devices, CA) to simultaneously monitor Fluo-3 fluorescence in all wells (λexcitation=488 nm, λemission=540 nm) during challenge with agonist (capsaicin). The IC50 values were determined. Cells were challenged with 150 nM capsaicin and the fluorescence counts were captured following agonist addition at a sampling rate of 0.33 Hz. The contents of the wells were mixed 3 times (40 μL mix volume) immediately after the additions were made. Concentration dependence of block was determined by exposing each well of cells in duplicate rows of a 96 well plate to a serial dilution of test compound. The concentration series usually started at 10 Î¼M with a three-fold serial decrement in concentration. The magnitude of the capsaicin response was determined by measuring the change in fluo3 fluorescence before and 100 seconds after the addition of the agonist.
- Assay organism: Rattus norvegicus
- Assay cell type: HEK293
- Target name: Transient receptor potential cation channel subfamily V member 1
- Target type: SINGLE PROTEIN
- Target organism: Rattus norvegicus

## Reference Molecule A
- Canonical SMILES: CN(c1nc2c(c(Nc3ccc(C(F)(F)F)nc3)n1)CCN(c1ncccc1C(F)(F)F)CC2)C1CCCCC1
- Properties:
- ChEMBL ID: CHEMBL3899860
- Molecule type: Small molecule
- Molecular weight: 565.57
- Heavy atoms: 40
- Hydrogen bond donors: 1
- Hydrogen bond acceptors: 7
- TPSA: 70.07
- LogP: 6.42
- Rotatable bonds: 5
- Ring count: 5
- Aromatic rings: 3
- Formal charge: 0
- Fraction Csp3: 0.48
- QED: 0.36

## Known Reference Result on This Endpoint
- Molecule A clean result: median pChEMBL = 6.72
- This result is provided as context for predicting Molecule B on the same endpoint.

## Reference Molecule A Other ChEMBL Evidence
- type IC50; relation =; value 190; units nM; pChEMBL 6.72; comment 427145

## Query Molecule B
- Canonical SMILES: FC(F)(F)c1ccc(Nc2nc(N[C@@H]3CCOC3)nc3c2CCN(c2ncccc2C(F)(F)F)CC3)nc1
- Properties:
- ChEMBL ID: CHEMBL4112003
- Molecule type: Small molecule
- Molecular weight: 539.48
- Heavy atoms: 38
- Hydrogen bond donors: 2
- Hydrogen bond acceptors: 8
- TPSA: 88.09
- LogP: 4.85
- Rotatable bonds: 5
- Ring count: 5
- Aromatic rings: 3
- Formal charge: 0
- Fraction Csp3: 0.42
- QED: 0.45

## Molecule Similarity
- Weighted Tanimoto: 0.45

Answer: 5.84