[N+:1]([C:4]1[CH:5]=[C:6]2[C:11](=[CH:12][CH:13]=1)[NH:10][C:9](=[O:14])[C:8]([C:15]([O:17]CC)=[O:16])=[CH:7]2)([O-:3])=[O:2].[OH-].[Na+]>Cl>[N+:1]([C:4]1[CH:5]=[C:6]2[C:11](=[CH:12][CH:13]=1)[NH:10][C:9](=[O:14])[C:8]([C:15]([OH:17])=[O:16])=[CH:7]2)([O-:3])=[O:2]A mixture of 9.7 g (37 mmol) of the above ester and 200 ml of 1 N sodium hydroxide is heated on the steam bath for 11/4 hours. The resulting suspension is poured over ice and acidified with 250 ml of 1 N hydrochloric acid. The solid is collected by filtration and washed with water and ethanol to give 8.15 g the title acid, mp>310°.
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