2-(1-ACETIMIDOYL-5-CARBAMOYLPYRROLIDIN-3-YLTHIO-6-(1-HYDROXYETHYL)-1-METHYLCARBAPEN-2-EM-3-CARBOXYLIC ACID

摘要

Compounds of formula (I): <IMAGE> (I) wherein: one or both of R1 and R2 are selected from a variety of organic groups; R3 is an optionally substituted heterocycle; and R4 is hydrogen or optionally substituted alkyl or alkoxy. and salts and esters thereof have valuable antibiotic activity.