8,9-Dimethoxy-2-(prop-1-en-2-yl)-1,2-dihydrochromeno[3,4-b]furo[2,3-h]chromen-6(12H)-one;furo[2',3':7,8][1]benzopyrano[2,3-c][1]benzopyran-6(12H)-one, 1,2-dihydro-8,9-dimethoxy-2-(1-methylethenyl)-
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