[2S-[2alpha,3beta(2'S*,3'S*)]]-2,2'-bis(3,4-dihydroxyphenyl)-2,2',3,3'-tetrahydro-3',5,5',7,7'-pentahydroxy[3,8'-bi-4H-1-benzopyran]-4,4'-dione

(2S)-2α-(3,4-Dihydroxyphenyl)-2,3-dihydro-5,7-dihydroxy-3β-[[(2R)-3,4-dihydro-2α-(3,4-dihydroxyphenyl)-4-oxo-3β,5,7-trihydroxy-2H-1-benzopyran]-8-yl]-4H-1-benzopyran-4-one