ceftezole 440.014 440.484 C(O)(=O)C=1N2[C@@]([C@@H](C2=O)NC(CN3C=NN=N3)=O)(SCC1CSC4=NN=CS4)[H] C13H12N8O4S3 CAS:26973-24-0 CHEBI:135716 DZMVCVMFETWNIU-LDYMZIIASA-N Drug_Central:561 InChI=1S/C13H12N8O4S3/c22-7(1-20-4-14-18-19-20)16-8-10(23)21-9(12(24)25)6(2-26-11(8)21)3-27-13-17-15-5-28-13/h4-5,8,11H,1-3H2,(H,16,22)(H,24,25)/t8-,11-/m1/s1 ceftezol ceftezole sodium chebi_ontology demethyl cefazolin demethylcefazolin cephalosporin