## Endpoint to Predict
- Endpoint scope: assay
- Measurement type: IC50
- Label type: continuous
- Binary semantics: pchembl
- Assay description: Enzymatic Assay for Inhibition of PARP7: Displacement of Probe A, a biotinylated probe binding to the TIPARP active site, was measured using a time-resolved fluorescence energy transfer (TR-FRET) assay. 20 nL of a dose response curve of each test compound was spotted in black 384-well polystyrene proxiplates (Perkin Elmer) using a Mosquito (TTP Labtech). Reactions were performed in a 8 μL volume by adding 6 μL of TIPARP and Probe A in assay buffer (20 mM HEPES pH=8, 100 mM NaCl, 0.1% bovine serum albumin, 2 mM DTT and 0% Tween20), incubating with test compound at 25° C. for 30 min, then adding 2 μL of ULight-anti 6×His and LANCE Eu-W1024 labeled streptavidin (Perkin Elmer). The final concentrations of TIPARP and Probe A were 6 nM and 2 nM, respectively. The final concentration of ULight-anti 6xHis and LANCE Eu-W1024 labeled streptavidin were 4 nM and 0.25 nM, respectively. Reactions were incubated at 25° C. for an additional 30 min, then read on an Envision platereader equipped with a LANCE/DELFIA top mirror (Perkin Elmer) using excitation of 320 nm and emission of 615 nm and 665 nM with a 90 μs delay. The ratio of the 665/615 nm emission were calculated for each well to determine the amount of complex of TIPARP and Probe A in each well. Control wells containing a negative control of 0.25% DMSO vehicle or a positive control of 100 μM Example 190 were used to calculate the % inhibition as described below:% ⁢ ⁢ inhibition = 100 × TRF cmpd - TRF min TRF max - TRF minwhere TRFcmpd is the TR-FRET ratio from the compound treated well, TRFmin is the TR-FRET ratio from the Example 190-treated positive control well and TRFmax is the TR-FRET ratio from the DMSO-treated negative control well.The % inhibition values were plotted as a function of compound concentration and the following 4-parameter fit was applied to derive the IC50 the values:Y = Bottom + ( Top - Bottom ) ( 1 + ( X IC 50 ) Hill ⁢ ⁢ Coefficientwhere top and bottom are normally allowed to float, but may be fixed at 100 or 0 respectively in a 3-parameter fit. The Hill Coefficient is normally allowed to float but may also be fixed at 1 in a 3-parameter fit. Y is the % inhibition and x is the compound concentration.
- Target name: Protein mono-ADP-ribosyltransferase TIPARP
- Target type: SINGLE PROTEIN
- Target organism: Homo sapiens

## Reference Molecule A
- Canonical SMILES: N#Cc1ccc(N2CCN(C(=O)CCOC[C@H]3c4ncccc4CN3c3cn[nH]c(=O)c3Cl)CC2)nc1
- Properties:
- ChEMBL ID: CHEMBL6005182
- Molecular weight: 520.98
- Heavy atoms: 37
- Hydrogen bond donors: 1
- Hydrogen bond acceptors: 9
- TPSA: 131.34
- LogP: 1.9
- Rotatable bonds: 7
- Ring count: 5
- Aromatic rings: 3
- Formal charge: 0
- Fraction Csp3: 0.36
- QED: 0.46

## Known Reference Result on This Endpoint
- Molecule A clean result: median pChEMBL = 6.26
- This result is provided as context for predicting Molecule B on the same endpoint.

## Reference Molecule A Other ChEMBL Evidence
- type IC50; relation =; value 550; units nM; pChEMBL 6.26; comment 875312

## Query Molecule B
- Canonical SMILES: C[C@H](COCCC(=O)N1CCN(c2ncc(Cl)cn2)CC1)Oc1cn[nH]c(=O)c1C(F)(F)F
- Properties:
- ChEMBL ID: CHEMBL6019602
- Molecular weight: 490.87
- Heavy atoms: 33
- Hydrogen bond donors: 1
- Hydrogen bond acceptors: 8
- TPSA: 113.54
- LogP: 1.75
- Rotatable bonds: 8
- Ring count: 3
- Aromatic rings: 2
- Formal charge: 0
- Fraction Csp3: 0.53
- QED: 0.56

## Molecule Similarity
- Weighted Tanimoto: 0.36

Answer: 6.26