[CH3:1][C:2]1[CH:11]=[CH:10][CH:9]=[C:8]2[C:3]=1[C:4](=[O:24])[N:5]([C:18]1[CH:23]=[CH:22][CH:21]=[CH:20][CH:19]=1)[C:6]([CH:12]([O:14]C(=O)C)[CH3:13])=[N:7]2.C(=O)([O-])[O-].[K+].[K+].O>CO>[OH:14][CH:12]([C:6]1[N:5]([C:18]2[CH:19]=[CH:20][CH:21]=[CH:22][CH:23]=2)[C:4](=[O:24])[C:3]2[C:8](=[CH:9][CH:10]=[CH:11][C:2]=2[CH3:1])[N:7]=1)[CH3:13]Compound 180 (0.011 g, 0.034 mmol) was dissolved in methanol (2 mL), and potassium carbonate (0.012 g, 0.085 mmol) was added. The reaction mixture was stirred for 20 min, and then water (20 mL) was added. The mixture was extracted with ethyl acetate (3×10 mL) and the combined organic extracts were washed with saturated brine (10 mL). The organic solution was dried (MgSO4), filtered and concentrated under reduced pressure to give compound 181. ESI-MS m/z=281 (MH+). The reaction described above and compound 181 are shown below.
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