2'-Deoxy-8,2'-methylene-cycloguanosine 2-Dmcg 4H-Furo(3',2':4,5)pyrrolo(1,2-e)purin-4-one, 2-amino-1,6,6a,7,8,9a-hexahydro-7-hydroxy-8-(hydroxymethyl)-, (6aS-(6aalpha,7alpha,8beta,9aalpha))- 99921-84-3