(1)Benzopyrano(3,4-b)(1)benzopyran-12(6H)-one, 6a,12a-dihydro-2,3,9-trimethoxy-;[1]Benzopyrano[3,4-b][1]benzopyran-12(6H)-one, 6a,12a-dihydro-2,3,9-trimethoxy-;6a,12a-Dihydro-2,3,9-trimethoxy-(1)benzopyrano(3,4-b)(1)benzopyran-12(6H)-one
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