## Endpoint to Predict
- Endpoint scope: assay
- Measurement type: IC50
- Label type: continuous
- Binary semantics: pchembl
- Assay description: Inhibition Assay: Incubations were conducted in 96 well microtiter plates based on a method described by BD Biosciences. To the first well in each row, a NADPH regenerating system and test compound was added. In the second well and all remaining wells, NADPH regenerating system and acetonitrile (final concentration of 2%) was added. The final assay concentration of the NADPH regenerating system was 8.2 uM NADP+, 0.41 mM glucose-6-phosphate, 0.41 mM magnesium chloride hexahydrate and 0.4 U/ml glucose-6-phosphate dehydrogenase and 0.01 mg/mL control insect cell membrane protein. The test compound solution was serially diluted 1:3 through the eighth wells.The final concentration of the test compounds were in the range 100 uM to 45.7 nM in the eight rows. Wells 9 and 10 contained no test compound (only NADPH regenerating system and enzyme/substrate mix) and wells 11 and 12 were used as controls for background fluorescence (enzyme and substrate were added after the reaction was terminated). The plate was then pre-incubated at 37° C. for 10 min, and the reaction was initiated by the addition of pre-warmed enzyme/substrate mix. The assay concentration of the enzyme/substrate mix was 100 mM potassium phosphate, pH 7.4, 1.5 pmol recombinant human P450 CYP2D6 and 1.5 uM of the fluorescent substrate 3-[2-(N,N diethyl-N-methylamino)ethyl]-7-methoxy-4-methylcounnarin (AMMC). The assay was conducted in duplicate in a final volume of 200 uL per well. Reactions were terminated after 30 min by addition of a 4:1, acetonitrile:0.5 M Tris base solution. Quinidine was used as positive control, 0.5 uM as highest concentration. Fluorescence per well was measured using a fluorescence plate reader (excitation: 390 nm, emission: 460 nm).
- Assay organism: Homo sapiens
- Target name: Cytochrome P450 2D6
- Target type: SINGLE PROTEIN
- Target organism: Homo sapiens

## Reference Molecule A
- Canonical SMILES: C[C@@H](NC1CCCC(c2ccc(C(=O)O)cc2)C1)c1cccc2ccccc12
- Properties:
- ChEMBL ID: CHEMBL3917927
- Molecule type: Small molecule
- Molecular weight: 373.5
- Heavy atoms: 28
- Hydrogen bond donors: 2
- Hydrogen bond acceptors: 2
- TPSA: 49.33
- LogP: 5.92
- Rotatable bonds: 5
- Ring count: 4
- Aromatic rings: 3
- Formal charge: 0
- Fraction Csp3: 0.32
- QED: 0.58

## Known Reference Result on This Endpoint
- Molecule A clean result: median pChEMBL = 5
- This result is provided as context for predicting Molecule B on the same endpoint.

## Reference Molecule A Other ChEMBL Evidence
- type IC50; relation =; value 10000; units nM; pChEMBL 5; comment 440518

## Query Molecule B
- Canonical SMILES: C[C@@H](N[C@H]1CCC[C@H](c2ccc(C(=O)N3CCC(C(=O)O)CC3)cc2)C1)c1cccc2ccccc12
- Properties:
- ChEMBL ID: CHEMBL3894822
- Molecule type: Small molecule
- Molecular weight: 484.64
- Heavy atoms: 36
- Hydrogen bond donors: 2
- Hydrogen bond acceptors: 3
- TPSA: 69.64
- LogP: 6.15
- Rotatable bonds: 6
- Ring count: 5
- Aromatic rings: 3
- Formal charge: 0
- Fraction Csp3: 0.42
- QED: 0.44

## Molecule Similarity
- Weighted Tanimoto: 0.73

Answer: 4.8