The reaction of the sodium salt of 2-amino-4-(4-pyridinyl)-1,3,5-triazine (4) with t-butyl, isopropyl, phenyl, and p-chlorophenyl isocyanates formed the corresponding N-(alkyl or aryl)-2-amino-4-(4-pyridinyl)-1,3,5-triazines (6) whereas the reaction with methyl isocyanate and propyl isocyanate formed the expected N-alkyl-N'-[4-(4-pyridinyl)-1,3,5-triazin-2-yl]ureas (7).