Methyl (2β,3β,4β,5α,12β,19α)-4-acetoxy-15-[(13S,15R,16S,17R)-17-ethyl-16-hydroxy-13-(methoxycarbonyl)-1,11-diazatetracyclo[13.3.1.04,12.05,10]nonadeca-4(12),5,7,9-tetraen-13-yl
]-3-hydroxy-16-methoxy-1-methyl-6,7-didehydroaspidospermidine-3-carboxylate