79982-94-8 Cyclopenta(c)furo(3',2':4,5)furo(2,3-h)(1)benzopyran-1,11-dione, 8-(2-amino-1,6-dihydro-6-oxo-9H-purin-9-yl)-2,3,6a,8,9,9a-hexahydro-9-hydroxy-4-methoxy-, (6aS-(6aalpha,8beta,9alpha,9aalpha))-