The molecule is conjugate base of D-nopaline in which the three carboxy groups are anionic and the secondary amino and guanidino groups are cationic; major species at pH 7.3. It is a conjugate base of a D-nopaline.
(2R)-2-[[(1S)-1-carboxylato-4-(diaminomethylideneazaniumyl)butyl]azaniumyl]pentanedioate