NITROGEN-CONTAINING TETRACYCLIC COMPOUNDS

摘要

Nitrogen-containing tetracyclic compounds represented by general formula (I) or pharmaceutically acceptable salts thereof, wherein Y<1>-Y<2>-Y<3> represents N-C=N or C=C-NR<3> (wherein R<3> represents hydrogen, C1-5 alkyl or nitrogen-containing C2-10 alkyl); Y<4> represents S, SO, SO2, CH2 or NR<4> (wherein R<4> represents C1-5 alkanoyl or C1-5 alkyl); R<1> and R<2> are the same or different and each represents hydrogen, C1-10 alkyl, C3-15 alkoxyalkyl or C3-15 alkylaminoalkyl, or R<1> and R<2> form together with the adjacent nitrogen atom cyclic amino; X<1> and X<2> are the same or different and each represents hydrogen, C1-5 alkyl, C1-5 alkoxy or halogeno; and n is 0, 1 or 2.