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2,6-Pyridinedicarboxylicacid,4-[2-[(2S)-2-carboxy-2,3-dihydro-5-hydroxy-6-[[6-O-[(2E)-3-(4-hydroxy-3-methoxyphenyl)-1-oxo-2-propen-1-yl]-b-D-glucopyranosyl]oxy]-1H-indol-1-yl]ethenyl]-2,3-dihydro-,(2R related products: