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trans -2,5-Dimethyl-2,5-bis(2-carboxyethyl)pyrrolidinyl-1-oxy (14). A solution of 224 mg (1.0 mmol) of 12 and 11 mL of 2.5 N NaOH was heated at reflux for 44 h. The cooled solution (0 °C) was acidified with chilled 3 N HC1 and then extracted four times with EtOAc. The combined extracts were washed with brine, dried (MgS04), and concentrated. The crystalline residue was recrystallized from EtOAc-hexane to give 188 mg (73%) of nitroxide diacid 14 as yellow crystals: mp 127-131 °C; ESR