Synonyms: 2,4(1H,3H)-Pyrimidinedione,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-3-(3-methyl-2-butenyl)-,S,S-dioxide, [5R-(5a,6b,8b,9a)]-; 2,4(1H,3H)-Pyrimidinedione,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-3-(3-methyl-2-butenyl)-,[5R-(5a,6b,8b,9a)]- (9CI);1,7-Dioxa-2-thiaspiro[4.4]nonane, 2,4(1H,3H)-pyrimidinedione deriv.