5-((Dimethylamino)methyleneamino)pyrazole-4-carboxylic acid ethyl ester 5-(N,N-Dimethylformimidoyl)pyrazole-4-carboxylic acid ethyl ester 66751-69-7 BRN 5020971 Pyrazole-4-carboxylic acid, 5-(N,N-dimethylformimidoyl)-, ethyl ester