Cowden, William B. published the artcileCan nitrogen-15 NMR be used to determine the site of N-oxidation of pyrimidine-2,4-diamine?, Related Products of pyrimidines, the publication is Australian Journal of Chemistry (1981), 34(7), 1539-43, database is CAplus.
An examination of the products of N-oxidation of pyrimidine-2,4-diamine demonstrated that 15N spectroscopy is an unreliable technique for the determination of the site of N-oxidation The 15N shifts caused by N-oxidation were small and downfield and of no diagnostic value.
Australian Journal of Chemistry published new progress about 74638-76-9. 74638-76-9 belongs to pyrimidines, auxiliary class Pyrimidine, name is 2,4-Diaminopyrimidine-3-oxide, and the molecular formula is C4H6N4O, Related Products of pyrimidines.
Referemce:
https://pubchem.ncbi.nlm.nih.gov/compound/Pyrimidine,
Pyrimidine – Wikipedia