D-histidine zwitterion CHEBI:142967 0 155.06948 (2R)-2-azaniumyl-3-(1H-imidazol-4-yl)propanoate C=1(N=CNC1)C[C@H](C(=O)[O-])[NH3+] PMID:27230378 HNDVDQJCIGZPNO-RXMQYKEDSA-N MetaCyc:CPD-12151 A polar amino acid zwitterion restulting from the transfer of a proton from the carboxy group to the alpha-amino group of D-histidine. The major species at pH 7.3. 155.155 chebi_ontology InChI=1S/C6H9N3O2/c7-5(6(10)11)1-4-2-8-3-9-4/h2-3,5H,1,7H2,(H,8,9)(H,10,11)/t5-/m1/s1 C6H9N3O2 D-histidine (2R)-2-ammonio-3-(1H-imidazol-4-yl)propanoate D-histidine polar amino acid zwitterion