Cowden, William B. published the artcilePyrimidine N-oxides. VI. The ionization constants of pyrimidine-2,4-diamine N-oxides, Formula: C4H6N4O, the publication is Australian Journal of Chemistry (1984), 37(6), 1195-201, database is CAplus.
The ionization constants of some pyrimidine-2,4-diamines and their N-oxides, including the drugs trimethoprim and minoxidil, are reported. The syntheses of several pyrimidine-2,4-diamine N-oxides are described.
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, Formula: C4H6N4O.
Referemce:
https://pubchem.ncbi.nlm.nih.gov/compound/Pyrimidine,
Pyrimidine – Wikipedia