methyl (2beta,3beta,4beta,5alpha,12beta,19xi)-4-(acetyloxy)-15-[(5S,6S,8S)-5-ethyl-6-hydroxy-8-(methoxycarbonyl)-1,4,5,6,7,8,9,10-octahydro-2H-3,7-methanoazacycloundecino[5,4-b]indol-8-yl]-3-hydroxy-16-methoxy-1-methyl-6,7-didehydroaspidospermidine-3-carb