[C:1]([NH:4][CH2:5][C:6]1[CH:11]=[CH:10][C:9]([C:12]([CH3:18])([CH3:17])[C:13]([O:15]C)=[O:14])=[CH:8][CH:7]=1)(=[O:3])[CH3:2].[OH-].[Na+]>C(O)C.O>[C:1]([NH:4][CH2:5][C:6]1[CH:11]=[CH:10][C:9]([C:12]([CH3:18])([CH3:17])[C:13]([OH:15])=[O:14])=[CH:8][CH:7]=1)(=[O:3])[CH3:2]To a solution of methyl 2-(4-acetylaminomethylphenyl)-2-methylpropionate (23.47 g) in ethanol (160 ml) was added a solution of sodium hydroxide (7.53 g) in water (94 ml) and the mixture was stirred at 70° C. for 1 hr. The solvent was evaporated, and conc. hydrochloric acid was added. The resulting crystals were collected by filtration to give the title compound (14.0 g) as pale-yellow crystals, m.p.=166-169° C.
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