6-propoxy-5-pyrrolidin-1-yl-pyrazine-2-carboxylic acid ((S)-1-hydroxymethyl-3-methyl-butyl)-amide 、 、
5-cyclohexylamino-6-(2,2-dimethyl-propoxy)-pyrazine-2-carboxylic acid 、
2-氨基-2-乙基丁酸甲酯 生成 2-{[5-cyclohexylamino-6-(2,2-dimethyl-propoxy)-pyrazine-2-carbonyl]-amino}-2-ethyl-butyric acid methyl ester