A novel compound of the formula: A--Z--Ar.sup.1 1'CO--Ar.sup.2 wherein A is a condensed pyrimidinone or condensed pyridazinone ring; Ar.sup.1 and Ar.sup.2 are independently a ring; Z is a divalent group, or a salt thereof which have an excellent antitumor activity.
一种新化合物的公式为:A-Z-Ar.sup.1 1'CO-Ar.sup.2,其中A是紧缩的
嘧啶酮或紧缩的
吡啶并
噻唑酮环;Ar.sup.1和Ar.sup.2分别是环;Z是二价基团或其盐,具有优异的抗肿瘤活性。