cephalosporanic acid (6R)-3-[(acetyloxy)methyl]-8-oxo-5-thia-1-azabicyclo[4.2.0]oct-2-ene-2-carboxylic acid 257.036 257.26408 C10H11NO5S CHEBI:23064 InChI=1S/C10H11NO5S/c1-5(12)16-3-6-4-17-8-2-7(13)11(8)9(6)10(14)15/h8H,2-4H2,1H3,(H,14,15)/t8-/m1/s1 YGBFLZPYDUKSPT-MRVPVSSYSA-N [H][C@@]12CC(=O)N1C(C(O)=O)=C(COC(C)=O)CS2 chebi_ontology cephalosporin