Structure and relative stereochemistry of a new polycyclic alkaloid, asparagamine A, showing anti-oxytocin activity, isolated from Asparagus racemosus - Sekine,T.; Ikegami,F.; Fukasawa,N.; Kashiwagi,Y.; Aizawa,T.; Fujii,Y. (J Chem Soc Perkin Trans 1, 1995)