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(1E,2S)-5-carboxy-1-{(2E)-2-[(2S)-2,6-dicarboxy-2,3-dihydropyridin-4(1H)-ylidene]ethylidene}-7-oxo-1,2,3,7-tetrahydropyrano[3,4-b]pyrrol-1-ium-2-carboxylate related products: