20136-67-8

2 H -1-Benzopyran-3,4,5,7-tetrol, 2-[[2-(3,4-dihydroxyphenyl)-3,4-dihydro-5,7-dihydroxy-2 H -1-benzopyran-3-yl]oxy]-3,4-dihydro-2-(3,4,5trihydroxyphenyl)