参考文献:
BAYER SCHERING PHARMA AKTIENGESELLSCHAFT HUeBNER, Jan WEGSCHEID-GERLACH, Christof PANKNIN, Olaf RING, Sven BAeURLE, Stefan HUWE, Christoph NOWAK, Katrin NUBBEMEYER, Reinhard MUHN, Hans-Peter Patent: WO/76687 A, Location in patent: Page/Page column 9 WO /76687 A