1-[(1S,3aR,14bS)-2-methoxy-1,5,6,8,9,14b-hexahydro-4H- cyclopenta[a][1,3]dioxolo[4,5-h]pyrrolo[2,1-b][3]benzazepin-1-yl] 4-methyl (2R)-2- hydroxy-2-(4-hydroxy-4-methylpentyl)butanedioate
cephalotaxine, 4-methyl 2-hydroxy-2-(4-hydroxy-4-methylpentyl)butanedioate (Ester)