A quinazolinone derivatives having poly (adenosine 5′-diphaspho-ribose)polymerase (PARP) inhibotory activity represented by the formula (I), wherein R1 is optionally substituted cyclic amino groups or optionally substituted amino group, R2 is substituent, n means an integer from 0 to 4, and L is lower akkylene or lower alkenylene, or its prodrug, or their salts.
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A novel class of quinazolinone derivatives as potent poly(ADP-ribose)polymerase-1 (PARP-1) inhibitors has been discovered. Key to success was application of a rational discovery strategy involving structure-baseddesign, combinatorialchemistry, and classical SAR for improvement of potency and bioavailability. The new inhibitors were shown to bind to the nicotinamide-ribose binding site (NI site) and