环己胺 、
1-(2'-chloro-3'-pyridyl)-5-(chloromethyl)-1H-1,2,4-triazole-3-carboxylic acid 以there is obtained 5-cyclohexyl-4,5-dihydropyrido[2,3-e][1,2,4]triazolo[1,5-a]pyrazine-2-carboxylic acid的产率得到5-cyclohexyl-4,5-dihydropyrido[2,3-e][1,2,4]triazolo[1,5-a]pyrazine-2-carboxylic acid