、
4,5-二氯-2-(四氢-吡喃-2-基)-2H-吡嗪-3-酮 、
2,6-二氟苯酚 、
2-bromo-4-ethyl-hexanoic acid methyl ester 以afforded 2-[4-(2,6-difluoro-phenoxy)-6-oxo-6H-pyridazin-1-yl]-4-ethyl-hexanoic acid as a white solid (599.8 mg, 88% for the final step)的产率得到2-[4-(2,6-difluoro-phenoxy)-6-oxo-6H-pyridazin-1-yl]-4-ethyl-hexanoic acid