This invention provides compounds having antitumor effect, namely a compound represented by the following formula (I) or (Ia) having various substituents in which G and G1 are condensed tricyclic heterocyclic rings or salts thereof, and a compound represented by the following formula (Ib) having various substituents or salts thereof.
本发明提供了具有抗肿瘤作用的化合物,即具有不同取代基的以下式(I)或(Ia)所表示的化合物,其中G和G1是缩合的
三环杂环或其盐,以及具有不同取代基或其盐的以下式(Ib)所表示的化合物。