GRISEOLIC ACID MONOESTERS, THEIR PREPARATION AND USE

摘要

Monoester griseolic acid derivatives of formula (I): (in which: R<1> and R<2> are the same or different and each represents a hydrogen atom, a hydroxy group or a protected hydroxy group; R<3> and R<4> each represents a hydrogen atom, or together represent an extra carbon-carbon bond between the two carbon atoms to which they are attached; one of R<5> and R<6> represents a hydrogen atom and the other represents a carboxy-protecting group removable in the biochemical environment of the human eye); and pharmaceutically acceptable salts thereof have been found to have valuable properties in the treatment of ophthalmic disorders. They may be prepared by the selective esterification of the appropriate free acid.