79495-90-2 (1R,2S,4aR,5S,6R,8S,8aR)-8-(acetyloxy)-8a-[(acetyloxy)methyl]-5-[(3aR,6aS)-hexahydrofuro[2,3-b]furan-2-yl]-5,6-dimethyloctahydro-2H-spiro[naphthalene-1,2'-oxiran]-2-yl 2-methylpropanoate 33852-17-4 2,3,4,4a,5,6-Hexahydro-10,11-dimethoxy-1H,8H-pyrido[1,2:3,4]pyrimido[2,1-b]quinazolin-8-one