is conjugate acid of is tautomer of 6-aminopenicillanic acid 6-aminopenicillanate amino acid zwitterion 6-aminopenicillanic acid zwitterion (2S,5R,6R)-6-azaniumyl-3,3-dimethyl-7-oxo-4-thia-1-azabicyclo[3.2.0]heptane-2-carboxylate 0 216.057 216.25700 6-aminopenicillanate 6-azaniumyl-2,2-dimethylpenam-3alpha-carboxylate C8H12N2O3S CHEBI:57869 InChI=1S/C8H12N2O3S/c1-8(2)4(7(12)13)10-5(11)3(9)6(10)14-8/h3-4,6H,9H2,1-2H3,(H,12,13)/t3-,4+,6-/m1/s1 NGHVIOIJCVXTGV-ALEPSDHESA-N Zwitterionic form of 6-aminopenicillanic acid arising from migration of a proton from the carboxy group to the 6-amino group; major species at pH 7.3. [H][C@]12SC(C)(C)[C@@H](N1C(=O)[C@H]2[NH3+])C([O-])=O chebi_ontology