## Endpoint to Predict
- Endpoint scope: assay
- Measurement type: IC50
- Label type: continuous
- Binary semantics: pchembl
- Assay description: Homogenous Time-Resolved Fluorescence Assay: The standard assay conditions for the in vitro HTRF assay consisted of a 50 ul total reaction volume in black 384-well Costar polypropylene plates in 1×PBS buffer pH 7.4, 1 mM DTT, 0.1% BSA, 2.5 nM GST-hMDM2 (aa 1-188), 5 nM biotinylated-p53 (aa 1-83), 1.8 nM SA-XLent (Cisbio; Bedford, Mass.), 0.6 nM anti-GST cryptate monoclonal antibody (Cisbio; Bedford, Mass.) and 200 mM KF. Amino acid residues 1-188 of human MDM2 were expressed as an amino-terminal glutathione-S-transferase (GST) fusion protein (GST-hMDM2) in Escherichia coli. Residues 1-83 of human p53 were expressed as an amino-terminal AviTag¿-TrxA-6×His fusion protein (biotinylated p53) in E. coli. Each protein was purified from cell paste by affinity chromatography.Specifically, 10 uL of GST-hMDM2 was incubated with 10 ul of diluted compound (various concentrations, serially diluted) in 10% DMSO for 20 minutes at room temperature. 20 uL of biotinylated-p53 was added to the GST-hMDM2+compound mixture, and then incubated at room temperature for 60 min. 10 uL of detection buffer consisting of SA-XLent, anti-GST cryptate antibody and KF was added to GST-hMDM2, biotinylated-p53 and compound reaction and left at room temperature to reach equilibrium for >4 hrs. The final concentration of DMSO in the reaction was 2%. Time-resolved fluorescence readings were measured on a microplate multilabel reader. Percentage of inhibition was calculated relative to nutlin-3.As the potencies of the HDM2 inhibitors increased, an improved HTRF assay (HTRF2 assay) was developed. All assay conditions remained the same as described above, with the exception of the following changes in reagent concentrations: 0.2 nM GST-hMDM2 (1-188), 0.5 nM biotinylated-p53 (1-83), 0.18 nM SA-XLent, and 100 mM KF.
- Assay organism: Homo sapiens
- Target name: E3 ubiquitin-protein ligase Mdm2
- Target type: SINGLE PROTEIN
- Target organism: Homo sapiens

## Reference Molecule A
- Canonical SMILES: CC(C)(C)S(=O)(=O)C[C@H](C1CC1)N1C(=O)[C@@](C)(Cc2ccc(C(=O)O)cn2)O[C@H](c2cccc(Cl)c2)[C@H]1c1ccc(Cl)cc1
- Properties:
- ChEMBL ID: CHEMBL3233049
- Molecule type: Small molecule
- Molecular weight: 659.63
- Heavy atoms: 44
- Hydrogen bond donors: 1
- Hydrogen bond acceptors: 6
- TPSA: 113.87
- LogP: 6.72
- Rotatable bonds: 9
- Ring count: 5
- Aromatic rings: 3
- Formal charge: 0
- Fraction Csp3: 0.42
- QED: 0.27

## Known Reference Result on This Endpoint
- Molecule A clean result: median pChEMBL = 9.85
- This result is provided as context for predicting Molecule B on the same endpoint.

## Reference Molecule A Other ChEMBL Evidence
- type IC50; relation =; value 0.14; units nM; pChEMBL 9.85; comment 670553

## Query Molecule B
- Canonical SMILES: CC(C)(C)S(=O)(=O)C[C@H](C1CC1)N1C(=O)[C@@](C)(Cc2ncc(C(=O)O)s2)O[C@H](c2cccc(Cl)c2)[C@H]1c1ccc(Cl)c(F)c1
- Properties:
- ChEMBL ID: CHEMBL5964218
- Molecular weight: 683.65
- Heavy atoms: 44
- Hydrogen bond donors: 1
- Hydrogen bond acceptors: 7
- TPSA: 113.87
- LogP: 6.92
- Rotatable bonds: 9
- Ring count: 5
- Aromatic rings: 3
- Formal charge: 0
- Fraction Csp3: 0.45
- QED: 0.26

## Molecule Similarity
- Weighted Tanimoto: 0.73

Answer: 9.92