7-oxo-4,5,6,7-tetrahydrobenzothiophene-3-carboxylic acid 、
DL-对氟苯丙氨酸 以the title compound (190 mg) was obtained as a viscous yellow oily substance, in the same way as Preparation Example 116的产率得到3-(4-fluorophenyl)-2-[(7-oxo-4,5,6,7-tetrahydrobenzo[b]thiophene-3-carbonyl)amino]propionic acid