2H-1,3-Thiazine-2-acetic acid, alpha-((5-amino-5-carboxy-1-oxopentyl)amino)-4-carboxy-5-formyl-3,6-dihydro-, stereoisomer 5-Amino-5-carboxyvaleramido-(5-formyl-4-carboxy-2H,3H,6H-tetrahydro-1,3-thiazinyl)glycine 56136-29-9 Cephalosporate C-2 Cephalosporate C2