## Endpoint to Predict
- Endpoint scope: assay
- Measurement type: IC50
- Label type: continuous
- Binary semantics: pchembl
- Assay description: 5-HT2A Receptor Antagonism Activity Test: The 5-HT2A receptor antagonism activity test (The antagonism activity of test compounds on 5-HT2A receptor expressing human recombinant 5-HT2A receptor in CHO-K1 cells) was performed using FLIPR Calcium 5 Assay Kit (Product of Molecular Devices USA Inc.) according to the method documented in the kit instructions. The concentration of the test compounds was 0.1 nM-10000 nM and risperidone was used as a positive control. Test method is as follows: On the first day the seed cells are placed in T-175 flask containing 25 ml growth medium (F-12 nutrient mixture+10% FBS+1% penicillin/streptomycin+1.2% 50 mg/ml Geneticin) at a density of 14 million per bottle, cells were cultured under 37° C./5% CO2/humidified conditions for 24 hours; On the next day the seed cells were inoculated to the 384-well cell culture plate (each well containing 20,000 cells), the growth medium was replaced by 50 μL detecting medium (F-12 nutrient mixture+1.5% activated carbon-treated FBS), the cells were cultured under 37° C./5% CO2/humidified conditions for 16 hours; On the third day the medium was removed, each well of the cells plates were added with 24 μL freshly prepared loading dye solution (formulated according to the instructions), the plates were placed in an incubator and incubated under 37° C./5% CO2/humidified conditions for 120 minutes; transfer 6 μL test compound solution to the assay plate and gently shaking for one minute, incubated under 37° C./5% CO2/humidified conditions for 30 minutes; each well of the assay plate was added with 10 μL freshly prepared α-methyl-5-hydroxytryptamine solution (1.2 M, the final concentration of α-methyl-5-hydroxytryptamine is 300 nM), data were detected and analyzed by FLIPR (Product of US Molecular Devices Corporation). Inhibition rate of the compounds at different concentrations was calculated, IC50 value was calculated by the Excelfit software
- Assay organism: Homo sapiens
- Target name: 5-hydroxytryptamine receptor 2A
- Target type: SINGLE PROTEIN
- Target organism: Homo sapiens

## Reference Molecule A
- Canonical SMILES: COc1ccc2[nH]cc(CCCCN3CCN(c4cccc5sccc45)CC3)c2c1
- Properties:
- ChEMBL ID: CHEMBL5830707
- Molecular weight: 419.59
- Heavy atoms: 30
- Hydrogen bond donors: 1
- Hydrogen bond acceptors: 4
- TPSA: 31.5
- LogP: 5.54
- Rotatable bonds: 7
- Ring count: 5
- Aromatic rings: 4
- Formal charge: 0
- Fraction Csp3: 0.36
- QED: 0.4

## Known Reference Result on This Endpoint
- Molecule A clean result: median pChEMBL = 6.41
- This result is provided as context for predicting Molecule B on the same endpoint.

## Reference Molecule A Other ChEMBL Evidence
- type IC50; relation =; value 393; units nM; pChEMBL 6.41; comment 625050

## Query Molecule B
- Canonical SMILES: O=C1Cc2cc(CCN3CCN(c4cccc5sc(F)cc45)CC3)c(Cl)cc2N1
- Properties:
- ChEMBL ID: CHEMBL5858241
- Molecular weight: 429.95
- Heavy atoms: 29
- Hydrogen bond donors: 1
- Hydrogen bond acceptors: 4
- TPSA: 35.58
- LogP: 4.55
- Rotatable bonds: 4
- Ring count: 5
- Aromatic rings: 3
- Formal charge: 0
- Fraction Csp3: 0.32
- QED: 0.66

## Molecule Similarity
- Weighted Tanimoto: 0.32

Answer: 6.14