SMILES: CC(=O)OCC1=C(N2[C@@H]([C@@H](C2=O)N)SC1)C(=O)O
Description: The molecule is the alpha,beta-unsaturated monocarboxylic acid that is the active nucleus for the synthesis of cephalosporins and intermediates. It derives from a cephalosporanic acid. It is a tautomer of a 7beta-aminocephalosporanic acid zwitterion.