氯甲酸甲酯 、
3-{4-[4-(3-aminophenyl)piperazin-1-yl]butyl}-6,7-dimethoxychromen-4-one 以methyl (3-{4-[4-(6,7-dimethoxy-4-oxo-4H-chromen-3-yl)-butyl]-piperazin-1-yl}-phenyl)-carbamate is obtained的产率得到methyl (3-{4-[4-(6,7-dimethoxy-4-oxo-4H-chromen-3-yl)butyl]piperazin-1-yl}phenyl)carbamate