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