Compound status: 
Historic compound: While this compound has been used to interrogate specific protein targets, it is not a chemical probe and should not be used in assays that depend on a potent and selective modulator of the protein.
Note about activity: 

Intended target=PARPs; Phthalazinone is a relatively non-selective PARP inhibitor with insufficient potency, selectivity or validation in cells to be a chemical probe.

Probe Information