acetic acid 1-(2-formyl-pyridin-3-yl)-1-methyl-ethyl ester 、 {4-[(3,5-Dimethyl-pyridin-2-ylmethyl)-amino]-butyl}-carbamic acid tert-butyl ester 以gave acetic acid 1-(2-{[(4-tert-butoxycarbonylamino-butyl)-(3,5-dimethyl-pyridin-2-ylmethyl)-amino]-methyl}-pyridin-3-yl)-1-methyl-ethyl ester的产率得到acetic acid 1-(2-{[(4-tert-butoxycarbonylamino-butyl)-(3,5-dimethyl-pyridin-2-ylmethyl)-amino]-methyl}-pyridin-3-yl)-1-methyl-ethyl ester