Synonyms: Formamide,N-(2,6-diamino-1,4-dihydro-4-oxo-5-pyrimidinyl)-N-(1,2,3,6a,8,9,9a,11-octahydro-9-hydroxy-4-methoxy-1,11-dioxocyclopenta[c]furo[3',2':4,5]furo[2,3-h][1]benzopyran-8-yl)-,[6aS-(6aa,8b,9a,9aa)]-; Cyclopenta[c]furo[3',2':4,5]furo[2,3-h][1]benzopyran,formamide deriv.