1-(4-chlorobutyl)-2-ethyl-1H-imidazo[4,5-c]quinoline-4-amine 、
2-巯基嘧啶 以to provide 1.0 g of 2-ethyl-1-[4-(pyrimidin-2-ylthio)butyl]-1H-imidazo[4,5-c]quinolin-4-amine as an off white powder, m.p. 182-185° C.的产率得到2-ethyl-1-[4-(pyrimidin-2-ylthio)butyl]-1H-imidazo[4,5-c]quinolin-4-amine