(6aR,9aS)-4-Methoxy-2,3,6a,8,9,9a-hexahydrocyclopenta[c]furo[3',2':4,5]furo[2,3-h]chromen-11(1H)-one;cyclopenta[c]furo[3',2':4,5]furo[2,3-h][1]benzopyran-11(1H)-one, 2,3,6a,8,9,9a-hexahydro-4-methoxy-, (6aR,9aS)-
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