4H-1-Benzopyran-4-one,2-[5'-(3,4-dihydro-5,7-dihydroxy-4-oxo-2H-1-benzopyran-2-yl)-2',6-dihydroxy[1,1'-biphenyl]-3-yl]-2,3-dihydro-3,5,7-trihydroxy-,[2R-[2a(S*),3b]]-; Hypnogenol B
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