1-[(6R,8R,9R)-4-amino-9-hydroxy-6-(hydroxymethyl)-2,2-dioxo-1,7-dioxa-2λ⁶-thiaspiro[4.4]non-3-en-8-yl]pyrimidine-2,4-dione

1-[(6R,8R,9R)-4-amino-9-[tert-butyl(dimethyl)silyl]oxy-6-[[tert-butyl(dimethyl)silyl]oxymethyl]-2,2-dioxo-1,7-dioxa-2λ⁶-thiaspiro[4.4]non-3-en-8-yl]-3-prop-2-enylpyrimidine-2,4-dione

[(6R,8R,9R)-9-acetyloxy-4-amino-8-(5-methyl-2,4-dioxopyrimidin-1-yl)-2,2-dioxo-1,7-dioxa-2λ⁶-thiaspiro[4.4]non-3-en-6-yl]methyl benzoate

1-[(6R,8R,9R)-4-amino-9-[tert-butyl(dimethyl)silyl]oxy-6-[[tert-butyl(dimethyl)silyl]oxymethyl]-2,2-dioxo-1,7-dioxa-2λ⁶-thiaspiro[4.4]non-3-en-8-yl]-3-ethyl-5-methylpyrimidine-2,4-dione