C([O:4][C:5]1[C:6]([CH2:18][CH2:19][CH3:20])=[C:7]([CH:10]=[C:11]([N+:15]([O-:17])=[O:16])[C:12]=1[O:13][CH3:14])[CH:8]=[O:9])(=O)C.Cl>[OH-].[Na+]>[OH:4][C:5]1[C:6]([CH2:18][CH2:19][CH3:20])=[C:7]([CH:10]=[C:11]([N+:15]([O-:17])=[O:16])[C:12]=1[O:13][CH3:14])[CH:8]=[O:9]A suspension of the product from step (b) (39.5 g) in 20% sodium hydroxide solution (140 ml) was heated at 90° for 5 hours. The mixture was cooled and acidified wth dilute hydrochloric acid. The aqueous phase was extracted with ethyl acetate washed with brine, dried, filtered and evaporated to leave a brown oil (33 g) MS; m/e 239.
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