(3R-(3alpha,4abeta,5alpha,8alpha,8abeta,9S*,10S*))-5-ethenyl-3,4,4a,5,6,7,8,8a-octahydro-7-methylspiro(3,5,8-ethanylylidene-1H-pyrano(3,4-c)pyridine-10,3'-(3H)indol)-2'(1',H)-one, Gelsemin, Gelsamine, Spiro(3,5,8-ethanylylidene-1H-pyrano(3,4-c)pyridine-10,3'-(3H)indol)-2'(1'H)-one, 5-ethenyl-3,4,4a,5,6,7,8,8a-octahydro-7-methyl-, (3R-(3alpha,4abeta,5alpha,8alpha,8abeta,9S*,10S*))-, 3-ethenyl-1-methyl-2,3,3a,7,8,8a-hexahydro-1h,5h-spiro[3,8,5-(ethane[1,1,2]triyl)oxepino[4,5-b]pyrrole-4,3'-indol]-2'(1'h)-one,