Aspidospermidine-3-carboxylic acid, 4-(acetyloxy)-6,7-didehydro-15-((2R,4R,6S,8S)-4-(1,1-difluoroethyl)-1,3,4,5,6,7,8,9-octahydro-8-(methoxycarbonyl)-2,6-methano-2H-azecino(4,3-b)indol-8-yl)-3-hydroxy-16-methoxy-1-methyl-, methyl ester, (2beta,3beta,4beta,5alpha,12R,19alpha)-