3-cyclopentyl-2-[4-(2,6-difluoro-phenoxy)-6-oxo-6H-pyridazin-1-yl]-propionic acid 、
6-氨基烟酸甲酯 以afforded 6-{3-cyclopentyl-2-[4-(2,6-difluoro-phenoxy)-6-oxo-6H-pyridazin-1-yl]-propionylamino}-nicotinic acid methyl ester as a pale, yellow solid (720 mg, 66%)的产率得到6-{3-cyclopentyl-2-[4-(2,6-difluoro-phenoxy)-6-oxo-6H-pyridazin-1-yl]-propionylamino}-nicotinic acid methyl ester