1-{3-[(4-{1-[(1-acetylpiperidin-4-yl)carbonyl]piperidin-4-yl}piperazin-1-yl)carbonyl]-1-benzothiophen-2-yl}-3-ethylurea 、
顺丁烯二酸 以
乙醇 、
乙酸乙酯 为溶剂,
以562 mg的产率得到1-{3-[(4-{1-[(1-acetylpiperidin-4-yl)carbonyl]piperidin-4-yl}piperazin-1-yl)carbonyl]-1-benzothiophen-2-yl}-3-ethylurea maleate