is conjugate base of penicillinate anion oxacillin(1-) 2,2-dimethyl-6beta-(5-methyl-3-phenyl-1,2-oxazole-4-carboxamido)penam-3alpha-carboxylate 400.097 400.42800 6beta-(5-methyl-3-phenylisoxazol-4-yl)penicillanate Beilstein:4278284 C19H18N3O5S CHEBI:52132 InChI=1S/C19H19N3O5S/c1-9-11(12(21-27-9)10-7-5-4-6-8-10)15(23)20-13-16(24)22-14(18(25)26)19(2,3)28-17(13)22/h4-8,13-14,17H,1-3H3,(H,20,23)(H,25,26)/p-1/t13-,14+,17-/m1/s1 UWYHMGVUTGAWSP-JKIFEVAISA-M [H][C@]12SC(C)(C)[C@@H](N1C(=O)[C@H]2NC(=O)c1c(C)onc1-c1ccccc1)C([O-])=O chebi_ontology oxacillin