Synonyms: 2,6-Pyridinedicarboxylicacid, 4-[[(1,3-dicarboxypropyl)imino]ethylidene]-1,2,3,4-tetrahydro-,[S-[R*,R*-(E,?)]]-; 2,6-Pyridinedicarboxylic acid,4-[[N-(1,3-dicarboxypropyl)formimidoyl]methylene]-1,2,3,4-tetrahydro-(7CI,8CI); 2,6-Pyridinedicarboxylic acid,4-[[[(1S)-1,3-dicarboxypropyl]imino]ethylidene]-1,2,3,4-tetrahydro-, (2S,4E)-(9CI); Glutamic acid-betaxanthin; Vulgaxanthin II