## Endpoint to Predict
- Endpoint scope: assay
- Measurement type: IC50
- Label type: continuous
- Binary semantics: pchembl
- Assay description: Inhibition Assay: TrkAG595R (Kinase domain) kinase was expressed in Sf9 cells using pIEX-Bac-4, and purified by using affinity chromatography on AKTA Purifier (GE company). A testing platform for TrkAG595R kinase activity was established based on Homogeneous Time-Resolved Fluorescence (HTRF) assay, and the activities of the compounds were tested using the platform. The compounds were subjected to five-fold gradient dilution with 100% DMSO with a starting concentration of 200 μM (8 concentrations in total). 4 μL of diluted sample for each concentration was added to 96 μL of a reaction buffer (50 mM HEPES, pH7.4, 5 mM MgCl2, 0.1 mM NaVO3, 0% Tween-20, 0.01% BAS, 1 mM DTT and 50 nM SEB) and mixed homogeneously to be used as a 4* compound. The reaction buffer was used to formulate 2* TrkAG595R kinases (the final concentration was 0.2 nM) and a 4* substrate (ATP+TK peptide) (TK peptide, HTRF® KinEASE-TK, was purchased from Cisbio and the final concentration thereof was 1 μM, and the final concentration of ATP was 5 M) for use. 2.5 μL of the 4* compound was added to a 384-well plate (OptiPlate-384, purchased from PerkinElmer), and then 5 μL of the 2* TrkAG595R kinases were added, and mixed homogeneously by centrifugation. Then 2.5 μL of the 4* substrate mixture was added to initiate the reaction (the total reaction volume was 10 μL). The 384-well plate was placed in an incubator to react for 120 min at 23° C. Then the reaction was terminated by adding 5 μL of Eu3+ cryptate-labeled anti-phosphotyrosine antibody (HTRF® KinEASE-TK, purchased from Cisbio), and 5 μL of Streptavidin-XL-665 (HTRF® KinEASE-TK, purchased from Cisbio). After incubated for 60 min in the incubator, the fluorescence values were read out on Envision (purchased from PerkinElmer). The excitation wavelength was 320 nm, and the emission wavelengths for detection were 665 nm and 620 nm.
- Target name: High affinity nerve growth factor receptor
- Target type: SINGLE PROTEIN
- Target organism: Homo sapiens

## Reference Molecule A
- Canonical SMILES: C[C@@H]1CCc2ncc(F)cc2[C@H]2CCCN2c2ccn3nc(N)c(c3n2)C(=O)N1
- Properties:
- ChEMBL ID: CHEMBL6055865
- Molecular weight: 395.44
- Heavy atoms: 29
- Hydrogen bond donors: 2
- Hydrogen bond acceptors: 6
- TPSA: 101.44
- LogP: 2.25
- Rotatable bonds: 0
- Ring count: 5
- Aromatic rings: 3
- Formal charge: 0
- Fraction Csp3: 0.4
- QED: 0.61

## Known Reference Result on This Endpoint
- Molecule A clean result: median pChEMBL = 9
- This result is provided as context for predicting Molecule B on the same endpoint.

## Reference Molecule A Other ChEMBL Evidence
- type IC50; relation =; value 1.01; units nM; pChEMBL 9; comment 1081854

## Query Molecule B
- Canonical SMILES: Nc1nn2ccc3nc2c1C(=O)NCCCn1cc(F)cc(c1=O)[C@H]1C[C@H](F)CN31
- Properties:
- ChEMBL ID: CHEMBL5786503
- Molecular weight: 415.4
- Heavy atoms: 30
- Hydrogen bond donors: 2
- Hydrogen bond acceptors: 6
- TPSA: 110.55
- LogP: 1.04
- Rotatable bonds: 0
- Ring count: 5
- Aromatic rings: 3
- Formal charge: 0
- Fraction Csp3: 0.37
- QED: 0.57

## Molecule Similarity
- Weighted Tanimoto: 0.47

Answer: 8.85