2A,7B-DIHYDRO-2A,7B-DIMETHYL-1,2-DIOEXTO(3,4B)BENZOFURAN;2A,7B-DIHYDRO-2A,7B-DIMETHYL-1,2-DIOXETO(3,4-B)BENZOFURAN;2A,7B-DIHYDRO-7B-DIMETHOXY-1,2-DIOXETO-(3,4-B)BENZOFURAN
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