18766-56-8 2,6-Pyridinedicarboxylic acid, 4-(2-((2S)-2-carboxy-2,3-dihydro-5,6-dihydroxy-1H-indol-1-yl)ethenyl)-2,3-dihydro-, (2S)- 2,6-Pyridinedicarboxylic acid, 4-(2-(2-carboxy-2,3-dihydro-5,6-dihydroxy-1H-indol-1-yl)ethenyl)-2,3-dihydro-, (S-(R*,R))- 2181-76-2 48218-81-1 Betanidin