## Endpoint to Predict
- Endpoint scope: assay
- Measurement type: IC50
- Label type: continuous
- Binary semantics: pchembl
- Assay description: In Vitro Raf Activity Determination: Assay Materials: Assay buffer is 50 mM Tris, pH 7.5, 15 mM MgCl2, 0.01% Bovine Serum Albumin (BSA) and 1 mM dithiothreitol (DTT); Stop buffer is 60 mM ethylenediaminetetraacetic acid (EDTA) and 0.01% Tween® 20: b-Raf (V600E), active; biotinylated Mek, kinase dead; Alpha Screen detection kit (available from PerkinElmer, #6760617R); Anti phospho-MEK1/2 (available from Cell Signaling Technology, Inc. #9121); 384 well low volume assay plates (White Greiner® plates).Assay conditions: b-Raf (V600E) approximately 4 μM; c-Raf approximately 4 nM; biotinylated Mek, kinase dead approximately 10 nM; ATP 10 μM for BRAF (V600E) and 1 μM for CRAF; Pre-incubation time with compounds 60 minutes at room temperature; Reaction time 1 or 3 hours at room temperature.Assay protocol: Raf and biotinylated Mek (kinase dead) were combined at 2× final concentrations in assay buffer (50 mM Tris, pH 7.5, 15 mM MgCl2, 0.01% BSA and 1 mM DTT) and dispensed 5 ml per well in assay plates (Greiner white 384 well assay plates #781207) containing 0.25 ml of 40× of a Raf kinase inhibitor test compound diluted in 100% DMSO. The plate was incubated for 60 minutes at room temperature. The Raf kinase activity reaction was started by the addition of 5 mL per well of 2×ATP diluted in assay buffer. After 3 hours (b-Raf(V600E)) or 1 hour (c-Raf). The reactions were stopped and the phosphorylated product was measured using a rabbit anti-p-MEK (Cell Signaling, #9121) antibody and the Alpha Screen IgG (ProteinA) detection Kit (PerkinElmer #6760617R), by the addition of 10 mL to the well of a mixture of the antibody (1:2000 dilution) and detection beads (1:2000 dilution of both beads) in Stop/bead buffer (25 mM EDTA, 50 mM Tris, pH 7.5, 0.01% Tween20). The additions were carried out under dark conditions to protect the detection beads from light. A lid was placed on top of the plate and incubated for 1 hour at room temperature, after which the luminescence was read on a PerkinElmer Envision instrument. The concentration of each compound for 50% inhibition (IC50) was calculated by non-linear regression using XL Fit data analysis software.
- Target name: Serine/threonine-protein kinase B-raf
- Target type: SINGLE PROTEIN
- Target organism: Homo sapiens

## Reference Molecule A
- Canonical SMILES: COc1ncc(-c2cc(NC(=O)c3cc(C(F)(F)F)ccn3)ccc2C)cc1C1(O)COC1
- Properties:
- ChEMBL ID: CHEMBL5974593
- Molecular weight: 459.42
- Heavy atoms: 33
- Hydrogen bond donors: 2
- Hydrogen bond acceptors: 6
- TPSA: 93.57
- LogP: 3.95
- Rotatable bonds: 5
- Ring count: 4
- Aromatic rings: 3
- Formal charge: 0
- Fraction Csp3: 0.26
- QED: 0.6

## Known Reference Result on This Endpoint
- Molecule A clean result: median pChEMBL = 5.66
- This result is provided as context for predicting Molecule B on the same endpoint.

## Reference Molecule A Other ChEMBL Evidence
- type IC50; relation =; value 2206; units nM; pChEMBL 5.66; comment 605773

## Query Molecule B
- Canonical SMILES: COc1ncc(-c2cc(NC(=O)c3ccnc(C(C)(C)C#N)c3)ccc2C)cc1C1(F)COC1
- Properties:
- ChEMBL ID: CHEMBL5751350
- Molecular weight: 460.51
- Heavy atoms: 34
- Hydrogen bond donors: 1
- Hydrogen bond acceptors: 6
- TPSA: 97.13
- LogP: 4.71
- Rotatable bonds: 6
- Ring count: 4
- Aromatic rings: 3
- Formal charge: 0
- Fraction Csp3: 0.31
- QED: 0.57

## Molecule Similarity
- Weighted Tanimoto: 0.57

Answer: 5.89