D:A-Friedo-24,26-dinoroleana-1,3,5(10),7,14-pentaen-29-oicacid, 21-hydroxy-2,3-dimethoxy-15-methyl-22-oxo-, methyl ester, (20a,21b)-; 3-O-Methylnetzahualcoyone 2-enol methyl ether
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