3-cyclopentyl-2-(6-oxo-4-o-tolyloxy-6H-pyridazin-1-yl)-propionic acid 、
6-氨基烟酸甲酯 以afforded 6-[3-cyclopentyl-2-(6-oxo-4-o-tolyloxy-6H-pyridazin-1-yl)-propionylamino]-nicotinic acid methyl ester as a yellow solid (230 mg, 32%)的产率得到6-[3-cyclopentyl-2-(6-oxo-4-o-tolyloxy-6H-pyridazin-1-yl)-propionylamino]-nicotinic acid methyl ester