[OH:1][CH2:2][CH2:3][N:4]1[CH2:10][C:7]2([CH2:9][CH2:8]2)[C:6]2(OCC[O:11]2)[CH2:5]1.Cl>CC(C)=O>[OH:1][CH2:2][CH2:3][N:4]1[CH2:5][C:6](=[O:11])[C:7]2([CH2:8][CH2:9]2)[CH2:10]1The above product from Example 1 (100 mg) was mixed with 1N HCl (4 ml) and acetone (20 ml). The reaction was refluxed overnight and evaporated. The solution was basified with 2N NaOH and extracted with EtOAc. The combined organic layer was washed with H2O followed by brine, dried over Na2SO4 and evaporated. The residue was purified by column chromatography to give title compound. Mass: (M+1), 156
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