is conjugate base of penicillinate anion piperacillin(1-) 516.155 516.54700 6beta-{(2R)-2-[(4-ethyl-2,3-dioxopiperazin-1-yl)carboxamido]-2-phenylacetamido}-2,2-dimethylpenam-3alpha-carboxylate Beilstein:5369991 C23H26N5O7S CHEBI:52433 IVBHGBMCVLDMKU-GXNBUGAJSA-M InChI=1S/C23H27N5O7S/c1-4-26-10-11-27(19(32)18(26)31)22(35)25-13(12-8-6-5-7-9-12)16(29)24-14-17(30)28-15(21(33)34)23(2,3)36-20(14)28/h5-9,13-15,20H,4,10-11H2,1-3H3,(H,24,29)(H,25,35)(H,33,34)/p-1/t13-,14-,15+,20-/m1/s1 [H][C@]12SC(C)(C)[C@@H](N1C(=O)[C@H]2NC(=O)[C@H](NC(=O)N1CCN(CC)C(=O)C1=O)c1ccccc1)C([O-])=O chebi_ontology piperacillin