## Endpoint to Predict
- Endpoint scope: assay
- Measurement type: IC50
- Label type: continuous
- Binary semantics: pchembl
- Assay description: SYK Assa: SYK kinase assay is a standard kinase assay adapted to a 96 well plate format. This assay is performed in 96-well format for IC50 determination with 8 samples which represented 10 half log dilutions and a 40 μL reaction volume. The assay measures the incorporation of radiolabeled 33P γATP into an N-terminally biotinylated peptide substrate, derived from naturally occurring phosphoacceptor consensus sequence (Biotin-11aa DY*E). Phosphorylated products were detected upon termination of reactions with EDTA and the addition of Streptavidin coated beads. Representative results are in Table II above.Assay plates: 96-well MultiScreen 0.65 um filter plates (Millipore Cat. No.: MADVNOB10) Streptavidin coated beads: Streptavidin Sepharose¿, suspension 5 mL, in 50 mM EDTA/PBS diluted (1:100), (Amersham, Cat. No.: 17-5113-01)Compounds: 10 mM in 100% dimethylsulfoxide (DMSO), final conc.: compound 0-100 uM in 10% DMSOEnzyme: SYK RPA purified, truncated construct of Spleen Tyrosine Kinase aa 360-635, stock solution 1 mg/mL, MW: 31.2 KDa, final conc.:0 μM.Peptide 1: biotinylated peptide is derived from a naturally occurring phosphor-acceptor consensus sequence (Biotin-EPEGDYEEVLE), special order from QCB, stock solution 20 mM, final conc.: 5 μM.ATP: Adenosine-5′-triphosphate 20 mM, (ROCHE Cat. No.: 93202720), final concentration: 20 μMBuffer: HEPES: 2-Hydroxyethyl piperazine-2-ethanesulfonic acid (Sigma, Cat. No.: H-3375)final concentration: 50 mM HEPES pH7.5BSA: Bovine Serum Albumin Fraction V, fatty acid free (Roche Diagnostics GmbH, Cat. No. 9100221) diluted to a final concentration of 0.1%EDTA: EDTA stock solution 500 mM, (GIBCO, Cat. No.: 15575-038) final concentration: 0.1 mMDTT: 1,4-Dithiothreitol (Roche Diagnostics GmbH, Cat. No.: 197777), final conc.: 1 mMMgCl2×6H2O: MERCK, Cat. No.: 105833.1, final concentration: 10 mMAssay Dilution Buffer (ADB): 50 mM HEPES, 0.1 mM EGTA, 0.1 mM Na Vanadate, 0.1 mM β-glycerophosphate, 10 mM MgCl2, 1 mM DTT, 0.1% BSA, pH 7.5Bead wash buffer: 10 g/L PBS (Phosphate buffered saline) with 2M NaCl+1% phosphoric acid.
- Target name: Tyrosine-protein kinase SYK
- Target type: SINGLE PROTEIN
- Target organism: Homo sapiens

## Reference Molecule A
- Canonical SMILES: Cc1cccc(Nc2cc(Oc3cccc(F)c3)nnc2C(N)=O)n1
- Properties:
- ChEMBL ID: CHEMBL3237569
- Molecule type: Small molecule
- Molecular weight: 339.33
- Heavy atoms: 25
- Hydrogen bond donors: 2
- Hydrogen bond acceptors: 6
- TPSA: 103.02
- LogP: 2.95
- Rotatable bonds: 5
- Ring count: 3
- Aromatic rings: 3
- Formal charge: 0
- Fraction Csp3: 0.06
- QED: 0.74

## Known Reference Result on This Endpoint
- Molecule A clean result: median pChEMBL = 6.17
- This result is provided as context for predicting Molecule B on the same endpoint.

## Reference Molecule A Other ChEMBL Evidence
- type IC50; relation =; value 671; units nM; pChEMBL 6.17; comment 564063

## Query Molecule B
- Canonical SMILES: Cc1ccc(Nc2cc(NC(CN)CC(C)C)nnc2C(N)=O)nc1C(C)C
- Properties:
- ChEMBL ID: CHEMBL5920918
- Molecular weight: 385.52
- Heavy atoms: 28
- Hydrogen bond donors: 4
- Hydrogen bond acceptors: 7
- TPSA: 131.84
- LogP: 2.93
- Rotatable bonds: 9
- Ring count: 2
- Aromatic rings: 2
- Formal charge: 0
- Fraction Csp3: 0.5
- QED: 0.52

## Molecule Similarity
- Weighted Tanimoto: 0.36

Answer: 8.7