5-((1-(Dimethylamino)vinyl)amino)pyrazole-4-carboxylic acid ethyl ester 5-(N,N,1-Trimethylformimidoyl)pyrazole-4-carboxylic acid ethyl ester 66751-70-0 BRN 5025707 Pyrazole-4-carboxylic acid, 5-(N,N,1-trimethylformimidoyl)-, ethyl ester