gelsemine; 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; (3S,3aS,4S,5R,8S,8aS,9R)-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; (3S,3aS,4S,5R,8S,8aS)-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; (3S,3aR,4S)-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