(6aR-cis)-2,3,6a,8,9,9a-Hexahydro-4-methoxycyclopenta(c)furo(3',2':4,5)furo(2,3-h)(1)benzopyran-11(1H)-one 1503-44-2 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-cis)-