European Pharmacopoeia (EP) Reference Standard Synonym(s): (2 S ,5 R ,6 R )-3,3-Dimethyl-7-oxo-6-[[(thiophen-3-yl)acetyl]amino]-4-thia-1-azabicyclo[3.2.0]heptane-2-carboxylic acid; Decarboxyticarcillin Amino Acid Sequence: Empirical Formula: …