## Endpoint to Predict
- Endpoint scope: assay
- Measurement type: IC50
- Label type: continuous
- Binary semantics: pchembl
- Assay description: Inhibitory Activity Against Resistance Mutation of RET (In Vitro): Regarding the conditions for measurement of in vitro inhibitory activity of compounds against RET (V804L) (i.e., RET with V804L mutation) kinase activity, the website of AnaSpec states that Srctide (GEEPLYWSFPAKKK) corresponds to the substrate peptide for reaction to measure RET kinase activity. Thus, the amino acid sequence was partly modified and biotinylated to prepare biotinylated peptides (biotin-EEPLYWSFPAKKK). The purified recombinant human RET (V804L) protein used in the test was purchased from Eurofins.To measure the inhibitory activity, first, the test compounds were individually diluted with dimethyl sulfoxide (DMSO) stepwise. Subsequently, RET (V804L) protein, the substrate peptides (the final concentration: 250 nM), magnesium chloride (the final concentration: 10 mM), ATP (the final concentration: 10 μM), and a solution of a test compound in DMSO (the final concentration of DMSO: 5%) were added to a buffer for kinase reaction (13.5 mM Tris, pH of 7.5, 2 mM dithiothreitol, 0.01% Tween-20). Each of the mixtures was incubated at 25° C. for 120 minutes to perform a kinase reaction. EDTA was then added thereto to give a final concentration of 40 mM so that the reaction was terminated. A detection solution containing Eu-labeled antiphosphotyrosine antibody PT66 (PerkinElmer) and SureLight APC-SA (PerkinElmer) was added thereto, and each mixture was allowed to stand at room temperature for 2 hours or more. Finally, the intensity of fluorescence under excitation light with a wavelength of 337 nm was measured with a PHERAstar FS (BMG Labtech) at the two wavelengths of 620 nm and 665 nm. The phosphorylation level was calculated from the ratio of the fluorescence intensity at the two wavelengths, and the compound concentration at which phosphorylation was inhibited by 50% was defined as the IC50 value (nM).
- Target name: Proto-oncogene tyrosine-protein kinase receptor Ret
- Target type: SINGLE PROTEIN
- Target organism: Homo sapiens

## Reference Molecule A
- Canonical SMILES: COCc1ccc(NC(=O)c2c(C#Cc3csc(C)n3)n(C3(C)CC3)c3ncnc(N)c23)cc1
- Properties:
- ChEMBL ID: CHEMBL6015123
- Molecular weight: 472.57
- Heavy atoms: 34
- Hydrogen bond donors: 2
- Hydrogen bond acceptors: 7
- TPSA: 107.95
- LogP: 4.09
- Rotatable bonds: 5
- Ring count: 5
- Aromatic rings: 4
- Formal charge: 0
- Fraction Csp3: 0.28
- QED: 0.42

## Known Reference Result on This Endpoint
- Molecule A clean result: median pChEMBL = 8.7
- This result is provided as context for predicting Molecule B on the same endpoint.

## Reference Molecule A Other ChEMBL Evidence
- type IC50; relation =; value 2; units nM; pChEMBL 8.7; comment 599163

## Query Molecule B
- Canonical SMILES: COCc1ccc(NC(=O)c2c(C#CCN3CCSCC3)n(C3(C)CC3)c3ncnc(N)c23)cc1
- Properties:
- ChEMBL ID: CHEMBL5895415
- Molecular weight: 490.63
- Heavy atoms: 35
- Hydrogen bond donors: 2
- Hydrogen bond acceptors: 7
- TPSA: 98.3
- LogP: 3.32
- Rotatable bonds: 6
- Ring count: 5
- Aromatic rings: 3
- Formal charge: 0
- Fraction Csp3: 0.42
- QED: 0.51

## Molecule Similarity
- Weighted Tanimoto: 0.69

Answer: 9.52