11,21-cycloaspidospermidine-1,2-dicarboxylic acid, 16,17-dimethoxy-21-oxo-, dimethyl ester, (2beta,12beta,19alpha)- InChI=1/C25H30N2O7/c1-31-17-7-6-14-18(19(17)32-2)27(22(30)34-4)24(21(29)33-3)10-9-23-8-5-11-26-13-15(16(28)12-23)25(14,24)20(23)26/h6-7,15,20H,5,8-13H2,1-4H3/t15?,20-,23+,24+,25-/m0/s Methyl 11,12-dimethoxychanofruticosinate dimethyl (2beta,12beta,19alpha)-16,17-dimethoxy-21-oxo-11,21-cycloaspidospermidine-1,2-dicarboxylate