[9,9'-Bi-4H-naphtho[2,3-b]pyran]-4,4'-dione,2,2',3,3'-tetrahydro-5',6,6',8,8'-pentahydroxy-2,2',3-trimethyl-, stereoisomer;4H-Naphtho[2,3-b]pyran, bimol. deriv.; Ustilaginoidin E
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