参考文献:
BOEHRINGER INGELHEIM INTERNATIONAL GMBH ABEYWARDANE, Asitha FARMER, Bennett FARROW, Neil Alexander GAO, Donghong A. HEIM-RIETHER, Alexander KEENAN, Lana Louise Smith MUGGE, Ingo Andreas TAYLOR, Steven John XIONG, Zhaoming YU, Yang ZHANG, Qiang Patent: WO00/4588 A, 00 Location in patent: Page/Page column 9 9 WO 00/04588 A