13798-16-8

(1E,2S)-2-carboxy-1-{(2E)-2-[(2R)-2,6-dicarboxy-2,3-dihydropyridin-4(1H)-ylidene]ethylidene}-6-hydroxy-2,3-dihydro-1H-indolium-5-yl 6-O-sulfonato-beta-D-glucopyranoside