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(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 related products: