## Endpoint to Predict
- Endpoint scope: assay
- Measurement type: IC50
- Label type: continuous
- Binary semantics: pchembl
- Assay description: Kinase Assay: In a typical assay 11 different concentrations of each compound (0.1 nM, 0.33 nM, 1.1 nM, 3.8 nM, 13 nM, 44 nM, 0.15 μM, 0.51 μM, 1.7 μM, 5.9 μM and 20 μM) were tested in duplicate within the same microtiter plate. To this end, 100-fold concentrated compound solutions (in DMSO) were previously prepared by serial dilution (1:3.4) of 2 mM stocks in a clear low volume 384-well source microtiter plate (Greiner Bio-One, Frickenhausen, Germany), from which 50 nl of compounds were transferred into a black low volume test microtiter plate from the same supplier. Subsequently, 2 μL of Bub1 (the final concentration of Bub1 was adjusted depending on the activity of the enzyme lot in order to be within the linear dynamic range of the assay: typically 200 ng/mL were used) in aqueous assay buffer [50 mM Tris/HCl pH 7.5, 10 mM magnesium chloride (MgCl2), 200 mM potassium chloride (KCl), 1 mM dithiothreitol (DTT), 0.1 mM sodium ortho-vanadate, 1% (v/v) glycerol, 0.01% (w/v) bovine serum albumine (BSA), 0.01% (v/v) Trition X-100 (Sigma), 1× Complete EDTA-free protease inhibitor mixture (Roche)] were added to the compounds in the test plate and the mixture was incubated for 15 min at 22° C. to allow pre-equilibration of the putative enzyme-inhibitor complexes before the start of the kinase reaction, which was initiated by the addition of 3 μL 1.67-fold concentrated solution (in assay buffer) of adenosine-tri-phosphate (ATP, 10 μM final concentration) and peptide substrate (1 μM final concentration). The resulting mixture (5 μL final volume) was incubated at 22° C. during 60 min., and the reaction was stopped by the addition of 5 μL of an aqueous EDTA-solution (50 mM EDTA, in 100 mM HEPES pH 7.5 and 0.2% (w/v) bovine serum albumin) which also contained the TR-FRET detection reagents (0.2 μM streptavidin-XL665 [Cisbio Bioassays, Codolet, France] and 1 nM anti-phosho-Serine antibody [Merck Millipore, cat. #35-002] and 0.4 nM LANCE EU-W1024 labeled anti-mouse IgG antibody [Perkin-Elmer, product no. AD0077, alternatively a Terbium-cryptate-labeled anti-mouse IgG antibody from Cisbio Bioassays can be used]). The stopped reaction mixture was further incubated 1 h at 22° C. in order to allow the formation of complexes between peptides and detection reagents.
- Assay organism: Homo sapiens
- Target name: Mitotic checkpoint serine/threonine-protein kinase BUB1
- Target type: SINGLE PROTEIN
- Target organism: Homo sapiens

## Reference Molecule A
- Canonical SMILES: O=C1CCCc2[nH]c(-c3ccncc3)c(Nc3ccccc3)c21
- Properties:
- ChEMBL ID: CHEMBL5879386
- Molecular weight: 303.37
- Heavy atoms: 23
- Hydrogen bond donors: 2
- Hydrogen bond acceptors: 3
- TPSA: 57.78
- LogP: 4.34
- Rotatable bonds: 3
- Ring count: 4
- Aromatic rings: 3
- Formal charge: 0
- Fraction Csp3: 0.16
- QED: 0.76

## Known Reference Result on This Endpoint
- Molecule A clean result: median pChEMBL = 7.92
- This result is provided as context for predicting Molecule B on the same endpoint.

## Reference Molecule A Other ChEMBL Evidence
- type IC50; relation =; value 12.1; units nM; pChEMBL 7.92; comment 828670

## Query Molecule B
- Canonical SMILES: Cc1cc(COCC(=O)Nc2cc(-c3[nH]c4c(c3Nc3ccccc3)C(=O)CCC4)ccn2)no1
- Properties:
- ChEMBL ID: CHEMBL5959229
- Molecular weight: 471.52
- Heavy atoms: 35
- Hydrogen bond donors: 3
- Hydrogen bond acceptors: 7
- TPSA: 122.14
- LogP: 4.79
- Rotatable bonds: 8
- Ring count: 5
- Aromatic rings: 4
- Formal charge: 0
- Fraction Csp3: 0.23
- QED: 0.34

## Molecule Similarity
- Weighted Tanimoto: 0.52

Answer: 8.18