## Endpoint to Predict
- Endpoint scope: assay
- Measurement type: IC50
- Label type: continuous
- Binary semantics: pchembl
- Assay description: Luciferase Reporter Gene Assay for ALK2 and TGFbeta Activity: In this reporter gene cell based ALK2 and TGFβ assay, the C2Cl2 cell line was employed for the measurement of ALK2 activity, using a BRE-Luc SMAD1/5/8 reporter and BMP6 as the agonist. The HEK293T cell line was employed to measure TGFβ activity, using a SBE-Luc SMAD2/3 reporter and TGFβ as the agonist. Luciferase reporter assays were read using Promega Steady-Glo Luciferase Assay System.Cells were plated in 96 well white clear bottom assay plates at 10 k cells/well for C2Cl2-BRE, 15 k cells/well for HEK293-SBE in DMEM containing 2% FBS 1% P/S. Cells were given a minimum of 4 hours in incubator at 37° C./5% CO2 to adhere prior to further treatment. Compounds were diluted in DMSO to a 10-point dilution curve and added to the plate to reach the following final concentrations: 10000, 3000, 1000, 300, 100, and 30 nM in the HEK293-SBE assay and 1000, 300, 100, 30, 10, 3, 1, 0.3 nM in the C2Cl2-BRE assay. Negative and positive control wells received 2 μL DMSO as vehicle treatment. Plates were returned to incubator for 45 minutes and then BMP6 and TGFB were added to a final concentration of 50 ng/mL and 5 ng/mL, respectively. Plates were returned to the incubator and left overnight. After a minimum of 18 hours post BMP6/TGFβ addition, the plates were read using Promega Steady-Glo Luciferase Assay System. A 1:1 mixture of prepared steady-glo and phenol free DMEM was prepared, and 50 μL/well was added to the assay plates whose media had been flicked off. Plates were given 10 minutes post steady-glo addition before luminescence was read on a Spectramax M5e microplate reader. Negative control wells were averaged and subtracted from all other wells on the plate. Inhibition was calculated as the percent of signal loss compared to the averaged positive control wells.
- Target name: Bone morphogenetic protein receptor type-1B
- Target type: SINGLE PROTEIN
- Target organism: Homo sapiens

## Reference Molecule A
- Canonical SMILES: COc1cc2c(-c3cnn4cc(N5CCC(N6CCN(C)CC6)CC5)cnc34)ccnc2cc1F
- Properties:
- ChEMBL ID: CHEMBL5956963
- Preferred name: KER-047
- Molecule type: Small molecule
- Max clinical phase: 2
- Molecular weight: 475.57
- Heavy atoms: 35
- Hydrogen bond donors: 0
- Hydrogen bond acceptors: 7
- TPSA: 62.03
- LogP: 3.31
- Rotatable bonds: 4
- Ring count: 6
- Aromatic rings: 4
- Formal charge: 0
- Fraction Csp3: 0.42
- QED: 0.45

## Known Reference Result on This Endpoint
- Molecule A clean result: median pChEMBL = 4.99
- This result is provided as context for predicting Molecule B on the same endpoint.

## Reference Molecule A Other ChEMBL Evidence
- type IC50; relation =; value 10350; units nM; pChEMBL 4.99; comment 1279893

## Query Molecule B
- Canonical SMILES: Cc1cc(-c2cnn3cc(N4CCN(C5CCNCC5)CC4)cnc23)c2ccccc2n1
- Properties:
- ChEMBL ID: CHEMBL5855250
- Molecular weight: 427.56
- Heavy atoms: 32
- Hydrogen bond donors: 1
- Hydrogen bond acceptors: 6
- TPSA: 61.59
- LogP: 3.13
- Rotatable bonds: 3
- Ring count: 6
- Aromatic rings: 4
- Formal charge: 0
- Fraction Csp3: 0.4
- QED: 0.54

## Molecule Similarity
- Weighted Tanimoto: 0.47

Answer: 5.39