(2R)-2-[(R)-carboxy{[(2R)-2-carboxy-2-(4-hydroxyphenyl)acetyl]amino}methoxymethyl]-5-{[(1-methyl-1H-tetrazol-5-yl)sulfanyl]methyl}-3,6-dihydro-2H-1,3-oxazine-4-carboxylic acid

B2FTM1 — beta-lactamase