2-Butenoic acid, 2-(hydroxymethyl)-, (hexahydro-7-((2-methyl-1-oxo-2-butenyl)oxy)-1H-pyrrolizin-1-yl)methyl ester, (1S-(1-alpha(Z),7-alpha(Z)-7a-beta))- 2492-09-3 Sarracin Sarracine