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Lithium aluminum hydride (4 mg) was added to a solution of methyl (E)-4-{(4S*,9aR*)-7-[3-methoxy-4-(4-methyl-1H-imidazol-1-yl)benzylidene]-6-oxooctahydroquinolizin-4-yl}benzoate (50 mg) in THF (1 mL) at 0° C., and the reaction solution was stirred at 0° C. for two hours. A saturated ammonium chloride solution and ethyl acetate were added to the reaction solution, and the organic layer was separated. The resulting organic layer was dried over magnesium sulfate and then concentrated under reduced pressure. The residue was purified by silica gel column chromatography (carrier: Chromatorex NH; elution solvent: ethyl acetate->ethyl acetate:methanol=5:1) to obtain 24 mg of the title compound. The property values of the compound are as follows.

1. customthe organic layer was separated
2. dry with materialThe resulting organic layer was dried over magnesium sulfate
3. concentrationconcentrated under reduced pressure
4. customThe residue was purified by silica gel column chromatography (carrier: Chromatorex NH; elution solvent: ethyl acetate->ethyl acetate:methanol=5:1)