2-(7-amino-5-methylsulfonyltriazolo[4,5-d]pyrimidin-2-yl)-5-(hydroxymethyl)oxolane-3,4-diol

2-(7-amino-5-fluorotriazolo[4,5-d]pyrimidin-3-yl)-5-(hydroxymethyl)oxolane-3,4-diol

[3,4-diacetyloxy-5-(3-acetyloxy-2-oxopyridin-1-yl)oxolan-2-yl]methyl acetate

1-[3,4-dihydroxy-5-(hydroxymethyl)oxolan-2-yl]-3-hydroxypyridin-2-one

3-isatylidene acetone