4-butylamino-6-chloro-2-methyl-5-nitropyridine-3-carboxylic acid,ethyl ester 、
乙胺 以4-butylamino-6-ethylamino-2methyl-5-nitropyridine-3-carboxylic acid ethyl ester is obtained的产率得到4-Butylamino-6-ethylamino-2-methyl-5-nitropyridin-3-carbonsaeure-ethylester