[C:1]([OH:10])(=[O:9])[C:2]1[C:3](=[CH:5][CH:6]=[CH:7][CH:8]=1)[OH:4].[OH-].[CH2:12]([N+:16]([CH2:22][CH2:23][CH2:24][CH3:25])([CH2:18][CH2:19][CH2:20][CH3:21])[CH3:17])[CH2:13][CH2:14][CH3:15]>CC(C)=O>[C:1]([O-:10])(=[O:9])[C:2]1[C:3](=[CH:5][CH:6]=[CH:7][CH:8]=1)[OH:4].[CH3:17][N+:16]([CH2:12][CH2:13][CH2:14][CH3:15])([CH2:22][CH2:23][CH2:24][CH3:25])[CH2:18][CH2:19][CH2:20][CH3:21].[C:1]([OH:10])(=[O:9])[C:2]1[C:3](=[CH:5][CH:6]=[CH:7][CH:8]=1)[OH:4]Salicylic acid (5-20 mmol) and tributylmethylammonium hydroxide (5 mmol, 40% solution in H2O) were dissolved in 20 ml of acetone stirred for 15 min at room temperature. The solvent was evaporated and the remaining viscous liquid was dried at 0.1 mbar with stirring for 24 hrs.
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