sodium salt of 2-guanidino-thiazole-4-carboxylic acid 、 ethyl (RS)-3-[(piperidine-3-carbonyl)-amino]-propionate hydrochloride 以there is obtained ethyl (RS)-3-[[1-(2-guanidino-thiazole-4-carbonyl)-piperidine-3-carbonyl]-amino]-propionate as a white foam的产率得到ethyl (RS)-3-[[1-(2-guanidino-thiazole-4-carbonyl)-piperidine-3-carbonyl]-amino]-propionate