Synonyms: 2(1H)-Pyrimidinone,4-amino-1-[4-amino-9-[[(1,1-dimethylethyl)dimethylsilyl]oxy]-6-[[[(1,1-dimethylethyl)dimethylsilyl]oxy]methyl]-2,2-dioxido-1,7-dioxa-2-thiaspiro[4.4]non-3-en-8-yl]-5-methyl-,[5R-(5a,6b,8b,9a)]-;1,7-Dioxa-2-thiaspiro[4.4]nonane, 2(1H)-pyrimidinone deriv.;2(1H)-Pyrimidinone,4-amino-1-[4-amino-9-[[(1,1-dimethylethyl)dimethylsilyl]oxy]-6-[[[(1,1-dimethylethyl)dimethylsilyl]oxy]methyl]-1,7-dioxa-2-thiaspiro[4.4]non-3-en-8-yl]-5-methyl-,S,S-dioxide, [5R-(5a,6b,8b,9a)]-