[CH2:1]([NH:8][C:9]1[CH:19]=[CH:18][C:12]([C:13]([O:15]CC)=[O:14])=[CH:11][CH:10]=1)[C:2]1[CH:7]=[CH:6][CH:5]=[CH:4][CH:3]=1.C(O)C.O.[OH-].[K+].Cl>O>[CH2:1]([NH:8][C:9]1[CH:10]=[CH:11][C:12]([C:13]([OH:15])=[O:14])=[CH:18][CH:19]=1)[C:2]1[CH:3]=[CH:4][CH:5]=[CH:6][CH:7]=1A mixture of 6.0 g. of ethyl p-benzylaminobenzoate (prepared as described in Example 9), 100 ml. of ethanol-water (9:1) and 6.0 g. of potassium hydroxide are refluxed for 3.5 hours. The mixture is acidified with concentrated hydrochloric acid, diluted with water, chilled, filtered and the solid washed with water to give pale cream crystals, m.p. 165°-168° C. Recrystallization from ethanol gives tan crystals, m.p. 167°-169° C.
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