(9bR)-7,9-Dihydroxy-2,6-diacetyl-8,9b-dimethyldibenzofuran-1,3(2H,9bH)-dione;[9bR,(+)]-2,6-Diacetyl-7,9-dihydroxy-8,9b-dimethyldibenzofuran-1,3(2H,9bH)-dione
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