参考文献:
BOEHRINGER INGELHEIM INTERNATIONAL GMBH PRIEPKE, Henning KUELZER, Raimund MACK, Juergen PFAU, Roland STENKAMP, Dirk PELCMAN, Benjamin ROENN, Robert LUBRIKS, Dimitrijs SUNA, Edgars Patent: WO0/7667 A, 0 Location in patent: Page/Page column 96 WO 0/07667 A