(2E,4E)-3,4-dihydroxybenzyl 5-phenylpenta-2,4-dienoate 2,4-pentadienoic acid, 5-phenyl-, (3,4-dihydroxyphenyl)methyl ester, (2E,4E)- 3,4-dihydroxybenzyl (2E,4E)-5-phenylpenta-2,4-dienoate InChI=1/C18H16O4/c19-16-11-10-15(12-17(16)20)13-22-18(21)9-5-4-8-14-6-2-1-3-7-14/h1-12,19-20H,13H2/b8-4+,9-5