2-Hydroxy-3-[3,4-dihydroxy-phenyl)-acryloyloxy]-succinic acid 2-O-Caffeoyl tartaric acid 2-{[(2E)-3-(3,4-dihydroxyphenyl)prop-2-enoyl]oxy}-3-hydroxysuccinic acid InChI=1/C13H12O9/c14-7-3-1-6(5-8(7)15)2-4-9(16)22-11(13(20)21)10(17)12(18)19/h1-5,10-11,14-15,17H,(H,18,19)(H,20,21)/b4-2 butanedioic acid, 2-[[(2E)-3-(3,4-dihydroxyphenyl)-1-oxo-2-propenyl]oxy]-3-hydroxy-