[9,9'-Bi-4H-naphtho[2,3-b]pyran]-4,4'-dione,2,3-dihydro-5,5',6,6',8,8'-hexahydroxy-2,2'-dimethyl-, stereoisomer;4H-Naphtho[2,3-b]pyran, bimol. deriv.; (-)-Dihydroustilaginoidin A;Ustilaginoidin G
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