Synonyms: (2S,3S,5R)-3-Methyl-7-oxo-3-(1H-1,2,3-triazol-1-ylmethyl)-4-thia-1-azabicyclo[3.2.0]heptane-2-carboxylic acid 4,4-dioxide; 2b-[(1,2,3-triazol-1-yl)methyl]-2a-methylpenam-3a-carboxylic acid 1,1-dioxide; Tazobactam acid; (2S,3S,5R)-3-Methyl-4,4,7-trioxo-3-(1H-1,2,3-triazol-1-ylmethyl)-4-thia-1-azabicyclo[3.2.0]heptane-2-carboxylic acid;