1-Acetylguanidine is a guanidine derivative.1-Acetylguanidine (N-Carbamimidoylacetamide) may be used in the synthesis of 1H-imidazol-2-amine derivatives. 1-Acetylguanidine may be used in the preparation of: 4-[5-(3-fluorophenyl)furan-2-yl]-2-acetylamino-5-methylimidazole novel series of amino-protected 6-alkyl-, 6-aryl-, 6-heteroaryl- and 5,6-fused-cycloalkane 4-trifluoromethyl-2-acetylaminopyrimidines new series of protected 6-alkyl- and 6-aryl-2-acetylamino-4(3H)-pyrimidinones 4-trifluoromethyl-6-(2,2-dimethoxyethyl)-2-acetylaminopyrimidine 1-Acetylguanidine is a guanidine derivative. 1-Acetylguanidine (N-Carbamimidoylacetamide) may be used in the synthesis of 1H-imidazol-2-amine derivatives. 1-Acetylguanidine may be used in the preparation of: 4-[5-(3-fluorophenyl)furan-2-yl]-2-acetylamino-5-methylimidazole novel series of amino-protected 6-alkyl-, 6-aryl-, 6-heteroaryl- and 5,6-fused-cycloalkane 4-trifluoromethyl-2-acetylaminopyrimidines new series of protected 6-alkyl- and 6-aryl-2-acetylamino-4(3H)-pyrimidinones 4-trifluoromethyl-6-(2,2-dimethoxyethyl)-2-acetylaminopyrimidine