CAS No 15167-84-7 , (2S)-5-[(2S,3R,4S,5S,6R)-3-[(2R,3R,4S,5S,6S)-6-carboxy-3,4,
5-trihydroxyoxan-2-yl]oxy-4,
5-dihydroxy-6-(hydroxymethyl)oxan-2-yl]oxy-1-[(2E)-2-[(2S)-2,
6-dicarboxy-2,3-dihydro-1H-pyridin-4-ylidene]ethylidene]-6-hydroxy-2,
3-dihydroindol-1-ium-2-carboxylate