## Endpoint to Predict
- Endpoint scope: assay
- Measurement type: IC50
- Label type: continuous
- Binary semantics: pchembl
- Assay description: In Vitro JAK Kinase Inhibition Assay: Tested compounds were dissolved in 100% DMSO, and obtained stock solutions were serially diluted in the reaction buffer (50 mM Tris pH 7.5, 10 mM MgCl2, 0.25 mM EGTA, 0.1 mM Na3VO4, 0.01% Triton X-100, 2.5 mM DTT). Recombinant kinases JAK1 (ProQinase), JAK2, or JAK3 (Carna Biosciences) were diluted in the dilution buffer (50 mM Tris-HCl pH 7.5, 150 mM NaCl, 10% glycerol, 0.05% Triton X-100, 1 mM DTT) to the final concentration 3 ng/μL (JAK1), 0.1 ng/μL (JAK2), or 0.2 ng/μL (JAK3). 5 μL of obtained solution of the compounds and 5 μL of the solution of respective kinases were added to the well of a 96-well plate. To initiate interaction between tested compounds and an enzyme, the plate was incubated for 10 minutes at 25° C. in a Plate-Thermo-Shaker with orbital stirring at 400 rpm. Wells of a negative control contained all reagents as mentioned above with the exception of tested compounds and kinase, and wells of a positive controls contained all reagents as mentioned above with the exception of tested compounds. Enzymatic reaction was initiated by the addition of 15 μL of the following solution: 5× concentrated reaction buffer (50 mM Tris pH 7.5, 10 mM MgCl2, 0.25 mM EGTA, 0.1 mM Na3VO4, 0.01% Triton X-100, 2.5 mM DTT), water, 30 μM ATP and for particular kinases: JAK160 μM peptide IRS-1 (Enzo), JAK2 or JAK310 μM peptide IGF-1Rtide (Lipopharm). Then the plate was incubated for 1 hour at 25° C. in a Plate-Thermo-Shaker, with orbital stirring at 400 rpm. Detection of ADP formed in the enzymatic reaction was then performed using ADP-Glo Kinase Assay kit (Promega). For this purpose, to the well of the 96-well plate 25 μL of ADP-Glo Reagent were added, and the plate was incubated for 40 minutes at 25° C. in a Plate-Thermo-Shaker with orbital stirring at 400 rpm. Then to the well of the 96-well plate 50 μL of Kinase Detection Reagent were added and the plate was incubated for 30 minutes at 25° C. in a Plate-Thermo-Shaker with orbital stirring at 400 rpm. After incubation, luminescence intensity was measured using Victor×Light luminometer (Perkin Elmer, Inc.).
- Assay organism: Homo sapiens
- Target name: Tyrosine-protein kinase JAK2
- Target type: SINGLE PROTEIN
- Target organism: Homo sapiens

## Reference Molecule A
- Canonical SMILES: CCOc1ccc(-c2cc3ncc(C(N)=O)c(N[C@@H]4CCN(c5ccc(C#N)nn5)CC4(C)C)n3n2)cn1
- Properties:
- ChEMBL ID: CHEMBL5984516
- Molecular weight: 512.58
- Heavy atoms: 38
- Hydrogen bond donors: 2
- Hydrogen bond acceptors: 10
- TPSA: 160.24
- LogP: 2.67
- Rotatable bonds: 7
- Ring count: 5
- Aromatic rings: 4
- Formal charge: 0
- Fraction Csp3: 0.35
- QED: 0.38

## Known Reference Result on This Endpoint
- Molecule A clean result: median pChEMBL = 7.46
- This result is provided as context for predicting Molecule B on the same endpoint.

## Reference Molecule A Other ChEMBL Evidence
- type IC50; relation =; value 34.4; units nM; pChEMBL 7.46; comment 1067097

## Query Molecule B
- Canonical SMILES: COc1cccc(-c2cc3ncc(C(N)=O)c(N[C@@H]4CCN(c5ccc(C#N)nn5)CC4(C)C)n3n2)n1
- Properties:
- ChEMBL ID: CHEMBL6029440
- Molecular weight: 498.55
- Heavy atoms: 37
- Hydrogen bond donors: 2
- Hydrogen bond acceptors: 10
- TPSA: 160.24
- LogP: 2.28
- Rotatable bonds: 6
- Ring count: 5
- Aromatic rings: 4
- Formal charge: 0
- Fraction Csp3: 0.32
- QED: 0.4

## Molecule Similarity
- Weighted Tanimoto: 0.75

Answer: 8.93