NOVEL TETRACYCLIC DERIVATIVES, PROCESS FOR THE PREPARATION THEREOF AND PHARMACEUTICAL COMPOSITIONS WHICH CONTAIN THEM

摘要

Compounds of formula (I): in which: > R1, R2 and R3, as described in the description, form a ring of formula (II) where R6 is a hydrogen or halogen atom, or an alkyl, alkoxy, amino, alkylamino or dialkylamino group, and X is a hydrogen atom or an N-OR7 group, > R4 and R5 are a hydrogen or halogen atom, or an alkyl, alkoxy, alkylamino or dialkylamino group, > A is as defined in the description, > B is an alkyl or alkenyl group substituted with a [-CHR8R9 group.