PENEM DERIVATIVES, METHODS OF PRODUCING THEM, THEIR USE AND PHARMACEUTICAL COMPOSITIONS

摘要

Compounds of the formula (I) …… wherein… R is a C1-C3 alkyl group substituted by a free or protected hydroxy;… Q<(+)> represents a group …… wherein R1 is always a substituent,… each of R2 and R3 is, independently, hydrogen or R1 provided that, when R2 and R3 are both hydrogen, then R1 is not a group …… wherein R4 and R5 are both hydrogen; and the pharmaceutically or veterinarily acceptable salts thereof. …Methods of producing them and their uses. The penem derivative possess valuable properties in pharmaceutical and veterinary compositions.