| abstract |
TETRACYCLIC COMPOUNDS, A PROCESS FOR THEIR PREPARATION AND PHARMACEUTICAL COMPOSITIONS CONTAINING THEM Compounds of formula I, of trans relative configuration: wherein: ò X represents an oxygen atom or an NR2 group, ò Y represents a group selected from ò R1 and R2, which may be the same or different, each represents a hydrogen atom or a group selected from alkyl, cycloalkyl and cycloalkylalkyl, in racemic form or in the form of optical isomers, and also addition salts thereof with a pharmaceutically acceptable acid, and hydrates thereof. Medicaments. |