## Endpoint to Predict
- Endpoint scope: assay
- Measurement type: IC50
- Label type: continuous
- Binary semantics: pchembl
- Assay description: Human NK1 Receptor Binding Assay: IM-9 cells (2×10^5 cells/mL) were cultured for 3 days after inoculation, and centrifuged at 500×g for 10 min to give cell pellets. The obtained pellets were washed with PBS (Phosphate-Buffered saline) (GIBCO), disrupted in buffer A (50 mM Tris-hydrochloric acid buffer (Tris-HCl) (pH 7.4) containing 120 mM sodium chloride, 5 mM potassium chloride, 2 μg/mL chymostatin, 40 μg/mL bacitracin, 40 μg/mL APMSF (p-amidinophenylmethanesulfonyl fluoride hydrochloride) and 1 mM ethylenediaminetetraacetic acid (EDTA)) using a Polytron homogenizer (Kinematika, Germany), and centrifuged at 100,000×g for 40 min. The precipitation fraction was suspended in buffer B (50 mM Tris-HCl (pH 7.4), 0.02% bovine serum albumin, 2 μg/mL chymostatin, 40 μg/mL bacitracin, 40 μg/mL APMSF, 3 mM manganese dichloride (MnCl2)) and cryopreserved (−80° C.) as a receptor reference standard. Buffer B (50 μL) was added to a 96-well microassay plate (Corning Incorporated). The membrane reference standard suspended in buffer B at 250 μg/mL was added by 50 μL. A measurement buffer containing 2% dimethyl sulfoxide was added by 50 μL to examine the total binding, 4 μM non-labeled SP diluted with a measurement buffer containing 2% dimethyl sulfoxide was added by 50 μL to examine the non-specific binding, and a test compound diluted with a measurement buffer (containing 2% dimethyl sulfoxide) was added by 50 μL to examine the binding inhibitory activity of the test compound. Furthermore, 400 μM 125I-Bolton-Hunter-SP (BH-SP) solution was added to each well by 50 μL. After reaction at room temperature for 30 min, the reaction was quenched using a cell harvester (PerkinElmer) by rapid filtration on a GF/C filter plate (PerkinElmer), and the cells were washed 10 times with 250 μL of a 50 mM Tris-hydrochloric acid buffer (pH 7.4) containing 0.02% bovine serum albumin. The GF/C filter plate was dried, MicroScinti-0 (PerkinElmer) was added by 20 μL, and the radioactivity was measured on a TopCount (PerkinElmer). The GF/C filter plate was immersed in 0.3% polyethyleneimine for one day before use.
- Assay organism: Homo sapiens
- Assay cell type: IM-9
- Target name: Tachykinin-3
- Target type: SINGLE PROTEIN
- Target organism: Homo sapiens

## Reference Molecule A
- Canonical SMILES: CC(=O)N1CCC(C(=O)N2CC[C@@H](N(C)C(=O)c3ccc(Br)cc3)C(c3ccc(Cl)c(Cl)c3)C2)CC1
- Properties:
- ChEMBL ID: CHEMBL3642157
- Molecule type: Small molecule
- Molecular weight: 595.36
- Heavy atoms: 36
- Hydrogen bond donors: 0
- Hydrogen bond acceptors: 3
- TPSA: 60.93
- LogP: 5.47
- Rotatable bonds: 4
- Ring count: 4
- Aromatic rings: 2
- Formal charge: 0
- Fraction Csp3: 0.44
- QED: 0.47

## Known Reference Result on This Endpoint
- Molecule A clean result: median pChEMBL = 7.62
- This result is provided as context for predicting Molecule B on the same endpoint.

## Reference Molecule A Other ChEMBL Evidence
- type IC50; relation =; value 24; units nM; pChEMBL 7.62; comment 213207

## Query Molecule B
- Canonical SMILES: CC(=O)N1CCC(C(=O)N2CC[C@@H](N(C)C(=O)c3ccc(C)cc3)C(c3ccc(Cl)c(Cl)c3)C2)CC1
- Properties:
- ChEMBL ID: CHEMBL3642159
- Molecule type: Small molecule
- Molecular weight: 530.5
- Heavy atoms: 36
- Hydrogen bond donors: 0
- Hydrogen bond acceptors: 3
- TPSA: 60.93
- LogP: 5.02
- Rotatable bonds: 4
- Ring count: 4
- Aromatic rings: 2
- Formal charge: 0
- Fraction Csp3: 0.46
- QED: 0.56

## Molecule Similarity
- Weighted Tanimoto: 0.86

Answer: 7.31