European Pharmacopoeia (EP) Reference Standard Synonym(s): (+)-6-Aminopenicillanic acid; (2 S ,5 R ,6 R )-6-Amino-3,3-dimethyl-7-oxo-4-thia-1-azabicyclo[3.2.0]heptane-2-carboxylic acid; 6-APA Empirical Formula: C8H12N2O3S Formula Weight: 216.26 Linear...