英文别名4-((2-Ethoxybenzylidene)amino)-1-methyl-3-propyl-1H-pyrazole-5-carboxamide; 1H-Pyrazole-5-carboxamide, 4-[[(2-ethoxyphenyl)methylene]amino]-1-methyl-3-propyl-; Sildenafil Impurity 84; (E)-4-((2-Ethoxybenzylidene)amino)-1-methyl-3-propyl-1H-pyrazole-5-carboxamide; Sildenafil Aldehyde Impurity 
