abstract |
(57) [Summary] [Object] To provide a novel heterocyclic compound and agent having excellent antitumor activity. [Structure] General formula AZ-Ar 1 -CO-Ar 2 [wherein A is an optionally substituted condensed pyrimidinone or condensed pyridazinone ring; Ar 1 and Ar 2 are each an optionally substituted ring; Z represents a divalent group. Or a salt thereof. |