(2R,3R)-2-[(E)-3-(3,4-dihydroxyphenyl)prop-2-enoyl]oxy-3-hydroxybutanedioic acid (2R,3R)-2-[(E)-3-(3,4-dihydroxyphenyl)prop-2-enoyl]oxy-3-hydroxy-butanedioic acid (2R,3R)-2-[(E)-3-(3,4-dihydroxyphenyl)-1-oxoprop-2-enoxy]-3-hydroxybutanedioic acid (2R,3R)-2-[(E)-3-(3,4-dihydroxyphenyl)acryloyl]oxy-3-hydroxy-succinic acid 67879-58-7 72880-50-3 Butanedioic acid, 2-(3-(3,4-dihydroxyphenyl)-1-oxo-2-propenyl)-3-hydroxy-, (R-(R*,R*-(E)))-