Antibiotics

摘要

The compounds of the formula (II): <IMAGE> (II) and salts and esters thereof wherein R1 is an inert organic group of up to 14 carbon atoms and R2 is an inert organic group of up to 16 carbon atoms, the group NR1R2 containing up to 22 carbon atoms, are antibacterial agents able to enhance the effectiveness of penicillins and cephalosporins against certain beta -lactamase producing bacteria.