ethyl 4-methyl-1-(5-oxa-2,6-diazaspiro[3.4]oct-6-en-7-yl)piperidine-4-carboxylate hydrochloride 、
4,5-二溴噻吩-2-甲醛 以the title compound was obtained in the similar manner as in Example 27的产率得到1-(2-((4,5-dibromo-2-thienyl)methyl)-5-oxa-2,6-diazaspiro[3.4]oct-6-en-7-yl)4-methylpiperidine-4-carboxylic acid