Heterocyclic compounds, their production and use

摘要

A heterocyclic compound represented by formula (I), wherein D stands for H or an optionally substituted hydrocarbon group; X stands for CH or N; A stands for a divalent aliphatic hydrocarbon group; R stands for an optionally substituted hydrocarbon group; Q stands for -N(R<0>)- (R<0> stands for hydrogen atom or a lower alkyl), O or S; Z stands for O or S; L and M independently stand for H, or they may optionally be combined with each other to form a bond; ring E may optionally be further substituted, and the substituent may optionally be combined with D to form a ring; or a salt thereof; which is useful as an antitumor agent.