## Endpoint to Predict
- Endpoint scope: assay
- Measurement type: Ki
- Label type: continuous
- Binary semantics: pchembl
- Assay description: 5-HT1A Receptor Binding Test: 1. Experimental Materials:The isotopic ligand of 5-H1A receptor [3H]0.8-OH-DPAT (purchased from PE Corporation), (+)5-hydroxytryptamine (purchased from Sigma Corporation), GF/B glassfiber filter (purchased from Whatman Corporation), fat-soluble scintillation fluid: PPO and POPOP (purchased from Shanghai No. 1 Reagent Factory), toluene (purchased from Sinopharm Chemical Reagent Co., Ltd), and Tris (imported and subpackaged).Cells: HEK-293 cells stably expressing 5-HT1A receptors as obtained by gene recombination are cultured for 3-5 days in cell culture medium DMEM supplemented with 10% serum. The cells are collected with PBS and centrifuged at −4° C. and 3000 rpm for 10 min, the supernatant is then discarded, and the cell pellets are collected, preserved in refrigerator at −80° C., and resuspended with D1 Binding Buffer (pH 7.4) before use.2. Experimental Methods:Competitive inhibition ratio of each compound at the concentration of 10 μmol/L to inhibit the binding of [3H]8-OH-DPAT to 5-HT1A receptor is determined for primary screening.Compounds with an inhibition ratio of over 95% are subjected to the receptor binding test at a series of concentrations so as to determine half maximal inhibitory concentration (IC50, the concentration of the compound required for inhibiting 50% binding of [3H]8-OH-DPAT to 5-HT1A receptor). Each concentration is tested in duplicate, and tests are carried out independently twice for each compound. Total binding tube [3H].8-OH-DPAT 20 μL D1 Binding Buffer 20 μL Cells 160 μL Non-specific tube [3H].8-OH-DPAT 20 μL 5-HT(10−4) 20 μL Cells 160 μL Tube with the [3H].8-OH-DPAT 20 μL compound to be tested The compound to be tested 20 μL Cells 160 μL The components are mixed to homogeneity, and then the above tubes are transferred to water bath at 30° C. (1 h), removed into ice bath immediately, and suction filtered on Harvest (with ice cold Tris eluate for 5 times). The filter membrane is dried over medium heat for 8 min, removed into a centrifuge tube (0.5 mL), added with scintillation fluid, and left standed for 30 min before measurement.1%=(total binding CPM−the tested compound CPM)/(total binding CPM−non-specific CPM)×100%Ki=IC50/(1+[L]/KD) (Ki: the affinity of the drug to the receptor, L: the concentration of the radioligand, KD: the value of the affinity of the radioligand to the receptor)
- Target name: 5-hydroxytryptamine receptor 1A
- Target type: SINGLE PROTEIN
- Target organism: Homo sapiens

## Reference Molecule A
- Canonical SMILES: O=C(N[C@H]1CC[C@@H](CCN2CCN(c3nsc4ccccc34)CC2)CC1)c1cc2ccccc2s1
- Properties:
- ChEMBL ID: CHEMBL5879756
- Molecular weight: 504.73
- Heavy atoms: 35
- Hydrogen bond donors: 1
- Hydrogen bond acceptors: 6
- TPSA: 48.47
- LogP: 6.01
- Rotatable bonds: 6
- Ring count: 6
- Aromatic rings: 4
- Formal charge: 0
- Fraction Csp3: 0.43
- QED: 0.35

## Known Reference Result on This Endpoint
- Molecule A clean result: median pChEMBL = 8
- This result is provided as context for predicting Molecule B on the same endpoint.

## Reference Molecule A Other ChEMBL Evidence
- type Ki; relation =; value 10.1; units nM; pChEMBL 8; comment 499619
- type Ki; relation =; value 10.1; units nM; pChEMBL 8; comment 499842

## Query Molecule B
- Canonical SMILES: N#Cc1ccc(C(=O)N[C@H]2CC[C@H](CCN3CCN(c4nsc5ccccc45)CC3)CC2)o1
- Properties:
- ChEMBL ID: CHEMBL5765463
- Molecular weight: 463.61
- Heavy atoms: 33
- Hydrogen bond donors: 1
- Hydrogen bond acceptors: 7
- TPSA: 85.4
- LogP: 4.26
- Rotatable bonds: 6
- Ring count: 5
- Aromatic rings: 3
- Formal charge: 0
- Fraction Csp3: 0.48
- QED: 0.59

## Molecule Similarity
- Weighted Tanimoto: 0.68

Answer: 8.4