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