3-cyclopentyl-2-[4-(2-fluoro-phenoxy)-6-oxo-6H-pyridazin-1-yl]-propionic acid 、
6-氨基烟酸甲酯 以afforded 6-{3-cyclopentyl-2-[4-(2-fluoro-phenoxy)-6-oxo-6H-pyridazin-1-yl]-propionylamino}-nicotinic acid methyl ester as a yellow solid (200 mg, 30%)的产率得到6-{3-cyclopentyl-2-[4-(2-fluoro-phenoxy)-6-oxo-6H-pyridazin-1-yl]-propionylamino}-nicotinic acid methyl ester