A quinazolinone derivatives having poly (adenosine 5'-diphospho-ribose) polymerase (PARP) inhibitory activity represented by the formula (I): wherein R1  is substituted cyclic amino groups or optionally substituted amino group, R2  is substituent, n means an integer of 0 to 4, and L1is (1) cyclo (lower) alkylene, (2) cyclo (lower) alkenylene, (3) diradical of saturated- or unsaturated monocyclic group with one or more nitrogen atom(s), which is obtained after removal of one hydrogen atom from said monocyclic group, or (4) -N (R3) -L2- (wherein R3 is hydrogen or lower alkyl, and L2 is lower alkylene or lower alkenylene), or its prodrug, or a salt thereof.
                            一种具有聚
腺苷酸二
磷酸核糖酶(PARP)抑制活性的
喹唑啉酮衍
生物,其
化学式为(I):其中R1为取代的环
氨基基团或可选取代的
氨基基团,R2为取代基,n表示0至4的整数,L1为(1)环(低)烷基,(2)环(低)烯基,(3)饱和或不饱和的含有一个或多个氮原子的单环基团的二重基,在从所述单环基团中去除一个氢原子后获得,或(4)-N(R3)-
L2-(其中R3为氢或低烷基,
L2为低烷基或低烯基),或其前药,或其盐。