title: Pyrimido(5,4-e)-as-triazines. VI. The preparation of some 5-substituted 7-aminopyrimido(5,4-e)-as-triazines.
mesh_terms: D000588:Amines; D003500:Cyclization; D008722:Methods; D011743:Pyrimidines / Q000138:chemical synthesis*; D014227:Triazines / Q000138:chemical synthesis*
chemical_list: D000588:Amines; D011743:Pyrimidines; D014227:Triazines