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