## Endpoint to Predict
- Endpoint scope: assay
- Measurement type: IC50
- Label type: continuous
- Binary semantics: pchembl
- Assay description: Radioligand Binding Assay on Mouse: HEK-293 cells stably expressing mouse TAAR1 were maintained at 37° C. and 5% CO2 in DMEM high glucose medium, containing fetal calf serum (10%, heat inactivated for 30 min at 56° C.), penicillin/streptomycin (1%), and 375 μg/ml geneticin (Gibco). Cells were released from culture flasks using trypsin/EDTA, harvested, washed twice with ice-cold PBS (without Ca2+and Mg2+), pelleted at 1,000 rpm for 5 min at 4° C., frozen and stored at −80° C. Frozen pellets were suspended in 20 ml HEPES-NaOH (20 mM, pH 7.4) containing 10 mM EDTA and homogenized with a Polytron (PT 6000, Kinematica) at 14,000 rpm for 20 s. The homogenate was centrifuged at 48,000×g for 30 min at 4° C. Subsequently, the supernatant was removed and discarded, and the pellet resuspended in 20 ml HEPES-NaOH (20 mM, pH 7.4) containing 0.1 mM EDTA using the Polytron (20 s at 14,000 rpm). This procedure was repeated and the final pellet resuspended in HEPES-NaOH containing 0.1 mM EDTA and homogenized using the Polytron. Typically, aliquots of 2 ml membrane portions were stored at −80° C. With each new membrane batch the dissociation constant (Kd) was determined via a saturation curve. The TAAR1 radioligand 3[H]-(S)-4-[(ethyl-phenyl-amino)-methyl]-4,5-dihydro-oxazol-2-ylamine (described in WO 2008/098857) was used at a concentration equal to the calculated Kd value, that was usually around 0.7 nM, resulting in the binding of approximately 0.5% of the radioligand and a specific binding representing approximately 70% of the total binding. Nonspecific binding was defined as the amount of 3[H]-(S)-4-[(ethyl-phenyl-amino)-methyl]-4,5-dihydro-oxazol-2-ylamine bound in the presence of 10 μM unlabeled ligand. All compounds were tested at a broad range of concentrations (10 μM to 10 μM) in duplicates. The test compounds (20 □μl/well) were transferred into a 96 deep well plate (TreffLab), and 180 μl of HEPES-NaOH (20 mM, pH 7.4) containing MgCl2 (10 mM) and CaCl2 (2 mM) (binding buffer), 300 μl of the radioligand 3[H]-(S)-4-[(ethyl-phenyl-amino)-methyl]-4,5-dihydro-oxazol-2-ylamine at a concentration of 3.3×Kd in nM and 500 μl of the membranes (resuspended at 60 protein per ml) added. The 96 deep well plates were incubated for 1 hr at 4° C. Incubations were terminated by rapid filtration through Unifilter-96 plates (Packard Instrument Company) and glass filters GF/C (Perkin Elmer) presoaked for 1 hr in polyethylenimine (0.3%) and washed 3 times with 1 ml of cold binding buffer. After addition of 45 μl of Microscint 40 (PerkinElmer) the Unifilter-96 plate was sealed and after 1 hr the ratioactivity counted using a TopCount Microplate Scintillation Counter (Packard Instrument Company).
- Assay organism: Rattus norvegicus
- Target name: Trace amine-associated receptor 1
- Target type: SINGLE PROTEIN
- Target organism: Rattus norvegicus

## Reference Molecule A
- Canonical SMILES: CC(C)c1cc(C(=O)Nc2ccc(C[C@@]34CN[C@@H](CO3)C4)cc2)[nH]n1
- Properties:
- ChEMBL ID: CHEMBL5837177
- Molecular weight: 340.43
- Heavy atoms: 25
- Hydrogen bond donors: 3
- Hydrogen bond acceptors: 4
- TPSA: 79.04
- LogP: 2.46
- Rotatable bonds: 5
- Ring count: 4
- Aromatic rings: 2
- Formal charge: 0
- Fraction Csp3: 0.47
- QED: 0.78

## Known Reference Result on This Endpoint
- Molecule A clean result: median pChEMBL = 5.93
- This result is provided as context for predicting Molecule B on the same endpoint.

## Reference Molecule A Other ChEMBL Evidence
- type IC50; relation =; value 1164; units nM; pChEMBL 5.93; comment 647326

## Query Molecule B
- Canonical SMILES: O=C(Nc1ccc(C[C@]23CN[C@H](CO2)C3)cc1)c1[nH]nc(C2CC2)c1Cl
- Properties:
- ChEMBL ID: CHEMBL5920908
- Molecular weight: 372.86
- Heavy atoms: 26
- Hydrogen bond donors: 3
- Hydrogen bond acceptors: 4
- TPSA: 79.04
- LogP: 2.87
- Rotatable bonds: 5
- Ring count: 5
- Aromatic rings: 2
- Formal charge: 0
- Fraction Csp3: 0.47
- QED: 0.75

## Molecule Similarity
- Weighted Tanimoto: 0.62

Answer: 6.2