3-Carboxy-2',4,5'-trihydroxy-trans-stilbene5-[(E)-2-(2,5-Dihydroxyphenyl)vinyl]-2-hydroxybenzoic acid5-[(E)-2-(2,5-Dihydroxyphenyl)ethenyl]-2-hydroxybenzoic acid5-[2-(2,5-Dihydroxyphenyl)ethenyl]-2-hydroxybenzoic Acidtrans-1-(3'-Carboxy-4'-hydroxyphenyl)-2-(2,5-dihydroxyphenyl)ethene