Patent ID: 8093294

Claim:
A process for treating a bacterial infection caused by metallo-β-lactamase producing bacteria, which comprises administering a compound represented by the following formula (I), or a salt thereof, as a metallo-β-lactamase inhibitor, to a mammal in need thereof: wherein: R 1 represents a C 2-6 alkyl group, a C 3-7 cycloalkyl group, a hydroxymethyl group, a —C 1-3 alkylene-phenyl group, a —C 0-1 alkylene-heterocycle, a —O—C 1-6 alkyl group, or a —S—C 1-6 alkyl group, all of which may be substituted; R 2 represents a C 1-6 alkyl group, a C 3-7 cycloalkyl group, a hydroxymethyl group, —C 1-3 alkylene-phenyl group, a —C 0-1 alkylene-heterocycle, a —O—C 1-6 alkyl group, or a —S—C 1-6 alkyl group, all of which may be substituted; and each M 1 independently represents a hydrogen atom, a pharmaceutically acceptable cation, or a pharmaceutically acceptable group which can be hydrolyzed in vivo.