Adenine is converted to adenosine or<unk>  monophosphate (IMP), either of which, in turn, is converted into<unk>  (I), which pairs with adenine (A), cytosine (C), and uracil (U). Purine nucleoside phosphorylase intraconverts<unk>  and hypoxanthine.<unk>  is also an intermediate in a chain of purine nucleotide reactions required for muscle movements.
Inosine
Choline
Homocysteine
Cysteamine
Inositol
Uridine triacetate
Fructosamine
Nicotinamide