{6-Cyclopropyl-2-oxo-3-[(5,6,7,8-tetrahydro-[1,8]naphthyridin-2-ylmethyl)-amino]-2H-pyridin-1-yl}-acetic acid 、
(S)-3-amino-3-(3-fluorophenyl)propionic acid ethyl ester hydrochloride 以to yield the title compound 17-9的产率得到3-(2-{6-Cyclopropyl-2-oxo-3-[(5,6,7,8-tetrahydro-[1,8]naphthyridin-2-ylmethyl)-amino]-2H-pyridin-1-yl}-acetylamino)-3(S)-(3-fluorophenyl)-propionic acid ethyl ester