cefacetrile 339.053 339.325 C(O)(=O)C=1N2[C@@]([C@@H](C2=O)NC(CC#N)=O)(SCC1COC(C)=O)[H] C13H13N3O6S CAS:10206-21-0 CHEBI:135437 Drug_Central:524 InChI=1S/C13H13N3O6S/c1-6(17)22-4-7-5-23-12-9(15-8(18)2-3-14)11(19)16(12)10(7)13(20)21/h9,12H,2,4-5H2,1H3,(H,15,18)(H,20,21)/t9-,12-/m1/s1 RRYMAQUWDLIUPV-BXKDBHETSA-N cefacetrile sodium cephacetril cephacetrile chebi_ontology cephalosporin