## Endpoint to Predict
- Endpoint scope: assay
- Measurement type: IC50
- Label type: continuous
- Binary semantics: pchembl
- Assay description: Kinase Homogeneous Time-Resolved Fluorescence Assay: The N-terminally His6-tagged recombinant kinase domain of the human c-Met (amino acids 960-1390), expressed in insect cells (SF21) and purified by Ni-NTA affinity chromatography and consecutive size exclusion chromatography (Superdex 200), is used. Alternatively, commercially available c-Met (Millipore) can be used. As substrate for the kinase reaction, the biotinylated poly-Glu, Tyr (4:1) copolymer (#61GTOBLC, Cis Biointernational, Marcoule, France) is used. For the assay, 50 mL of a 100-fold concentrated solution of the test compound in DMSO is pipetted into a black low-volume 384-well microtiter plate (Greiner Bio-One, Frickenhausen, Germany). 2 μL of a solution of c-Met in assay buffer [25 mM Hepes/NaOH, pH 7.5; 5 mM MgCl2; 5 mM MnCl2; 2 mM dithiothreitol; 0.1% (v/v) Tween 20 (Sigma); 0.1% (w/v) bovine serum albumin] are added, and the mixture is incubated for 15 min at 22° C. to allow pre-binding of the test compound to the enzyme before the start of the kinase reaction. Then, the kinase reaction is started by the addition of 3 μL of a solution of adenosine triphosphate (ATP, 16.7 μM; final concentration in the 5 μL assay volume is 10 μM) and substrate (2.27 μg/mL, final concentration in the 5 μL assay volume is 1.36 μg/mL Ë¿30 nM) in assay buffer, and the resulting mixture is incubated for a reaction time of 30 min at 22° C. The concentration of c-Met in the assay is adjusted depending on the activity of the enzyme lot and is appropriately chosen to have the assay in the linear range; typical enzyme concentrations are in the range of about 0.03 nM (final concentration in the 5 μL assay volume). The reaction is stopped by the addition of 5 μL of a solution of HTRF detection reagents [40 nM streptavidine-X Lent and 2.4 nM PT66-Eu-chelate, an europium-chelate labelled anti-phosphotyrosine antibody (Perkin-Elmer)] in an aqueous EDTA solution [100 mM EDTA, 0.2% (w/v) bovine serum albumin in 50 mM HEPES/NaOH, pH 7.5]. The resulting mixture is incubated for 1 h at 22° C. to allow the binding of the biotinylated phosphorylated peptide to the streptavidine-XLent and the PT66-Eu-chelate. Subsequently, the amount of phosphorylated substrate is evaluated by measurement of the resonance energy transfer from the PT66-Eu-chelate to the streptavidine-XLent. Therefore, the fluorescence emissions at 620 nm and 665 nm after excitation at 350 nm are measured in an HTRF reader, e.g. Rubystar (BMG Lab-technologies, Offenburg, Germany) or Viewlux (Perkin-Elmer). The ratio of the emissions at 665 nm and at 622 nm is taken as the measure for the amount of phosphorylated substrate.
- Target name: Hepatocyte growth factor receptor
- Target type: SINGLE PROTEIN
- Target organism: Homo sapiens

## Reference Molecule A
- Canonical SMILES: Cc1n[nH]c2cc(F)c(C3C(C#N)=C(C(F)F)NC(C(F)F)=C3C#N)cc12
- Properties:
- ChEMBL ID: CHEMBL3972144
- Molecule type: Small molecule
- Molecular weight: 379.29
- Heavy atoms: 27
- Hydrogen bond donors: 2
- Hydrogen bond acceptors: 4
- TPSA: 88.29
- LogP: 3.78
- Rotatable bonds: 3
- Ring count: 3
- Aromatic rings: 2
- Formal charge: 0
- Fraction Csp3: 0.24
- QED: 0.79

## Known Reference Result on This Endpoint
- Molecule A clean result: median pChEMBL = 8.52
- This result is provided as context for predicting Molecule B on the same endpoint.

## Reference Molecule A Other ChEMBL Evidence
- type IC50; relation =; value 3; units nM; pChEMBL 8.52; comment 420045

## Query Molecule B
- Canonical SMILES: CCC(F)(F)C1=C(C#N)C(c2ccc3[nH]nc(C)c3c2)C(C#N)=C(C)N1
- Properties:
- ChEMBL ID: CHEMBL3947404
- Molecule type: Small molecule
- Molecular weight: 353.38
- Heavy atoms: 26
- Hydrogen bond donors: 2
- Hydrogen bond acceptors: 4
- TPSA: 88.29
- LogP: 4.18
- Rotatable bonds: 3
- Ring count: 3
- Aromatic rings: 2
- Formal charge: 0
- Fraction Csp3: 0.32
- QED: 0.87

## Molecule Similarity
- Weighted Tanimoto: 0.45

Answer: 8.52