Gelsemine,1-methoxy-; 1-Methoxygelsemine; Alkaloid A, from Gelsemium sempervirens;Gelsevirine;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-1'-methoxy-7-methyl-, [3R-(3a,4ab,5a,8a,8ab,9S*,10S*)]-