C(OC([N:8]1[CH2:27][CH2:26][CH2:25][C:10]2([N:13]([C:14]([O:16][CH2:17][C:18]3[CH:23]=[CH:22][CH:21]=[CH:20][CH:19]=3)=[O:15])[CH2:12][CH:11]2[CH3:24])[CH2:9]1)=O)(C)(C)C.FC(F)(F)C(O)=O.[OH-].[Na+]>C(Cl)(Cl)Cl>[CH2:17]([O:16][C:14]([N:13]1[C:10]2([CH2:25][CH2:26][CH2:27][NH:8][CH2:9]2)[CH:11]([CH3:24])[CH2:12]1)=[O:15])[C:18]1[CH:19]=[CH:20][CH:21]=[CH:22][CH:23]=1To a solution of an optically-active compound of 3-methyl-1,6-diazaspiro[3,5]nonane-1,6-dicarboxylic acid 1-benzyl ester 6-tert-butyl ester (78 mg) in chloroform (2 ml) cooled to 4° C. was added trifluoroacetic acid (0.4 ml), and the mixture was warmed to room temperature and stirred for additional 1 hour. The reaction mixture was basified by the addition of 1M aqueous sodium hydroxide solution, and extracted with chloroform. The separated organic layer was washed with saturated aqueous sodium chloride solution, dried over anhydrous sodium sulfate and concentrated under reduced pressure to give the titled compound (108 mg).
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