Inosine is biological precursor of:
Orotic acid and Uridylic acid
Uracil and Thymine
Adenylic acid, Guanylic acid
Purines and Thymine
IMP (Inosine Mono Phosphate) the first purine nucleotide to be formed. It is the parent nucleotide which synthesize AMP & GMP and then diphosphate and triphosphate forms can be synthesized.
Nucleotides