[C:1]123[CH2:13][CH:8]4[CH2:9][CH:10]([CH2:12][CH:6]([CH2:7]4)[CH:5]1[NH:4]C(=O)[O:2]2)[CH2:11]3.[OH-].[K+]>O1CCOCC1>[NH2:4][CH:5]1[CH:6]2[CH2:7][CH:8]3[CH2:9][CH:10]([CH2:11][C:1]1([OH:2])[CH2:13]3)[CH2:12]22-Oxa-4-azatetracyclo[6.3.1.16,10.01,5]tridecan-3-one (76 mg, 0.395 mmol) in 1,4-dioxane (1 mL) was stirred with 5 M aqueous potassium hydroxide at 70° C. for 1 day. After completion of the reaction, the reaction solution was extracted with chloroform, and the organic layer was dried over anhydrous sodium sulfate and evaporated under reduced pressure to give the desired product (70% yield).
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