Mikhaleva, M. A. published the artcileSynthesis of Schiff bases of 2-substituted 5-aminopyrimidines and their mesomorphic properties, Computed Properties of 56621-93-3, the publication is Khimiya Geterotsiklicheskikh Soedinenii (1982), 1545-52, database is CAplus.
Schiff bases I (R = MeO, BuO, Me, Cl, CN, p-MeOC6H4, p-BuOC6H4, p-C6H13OC6H4, Ph, p-BrC6H4; R1 = alkoxy, NO2) were prepared in 32-100% yields by condensation of 4-R1C6H4CHO with the corresponding aminopyrimidine and the liquid crystal properties (anisotropic dielec. permeability) of I (R, R1 = MeO, C6H13O; BuO, C8H17O; Cl, C9H19O; CN, BuO; p-C6H13OC6H4, C6H13O) were determined
Khimiya Geterotsiklicheskikh Soedinenii published new progress about 56621-93-3. 56621-93-3 belongs to pyrimidines, auxiliary class Pyrimidine,Nitrile,Amine, name is 5-Aminopyrimidine-2-carbonitrile, and the molecular formula is C5H4N4, Computed Properties of 56621-93-3.
Referemce:
https://pubchem.ncbi.nlm.nih.gov/compound/Pyrimidine,
Pyrimidine – Wikipedia