C([O:3][C:4](=[O:30])[CH2:5][CH2:6][CH2:7][CH2:8][C:9]([NH:11][CH:12]1[CH2:17][CH2:16][N:15]([C:18]([O:20][CH2:21][C:22]2[CH:27]=[C:26]([Cl:28])[CH:25]=[C:24]([Cl:29])[CH:23]=2)=[O:19])[CH2:14][CH2:13]1)=[O:10])C.O[Li].O.Cl>C1COCC1.O.CCOC(C)=O>[Cl:28][C:26]1[CH:27]=[C:22]([CH:23]=[C:24]([Cl:29])[CH:25]=1)[CH2:21][O:20][C:18]([N:15]1[CH2:16][CH2:17][CH:12]([NH:11][C:9](=[O:10])[CH2:8][CH2:7][CH2:6][CH2:5][C:4]([OH:30])=[O:3])[CH2:13][CH2:14]1)=[O:19]To a suspension of 3,5-dichlorobenzyl 4-(6-ethoxy-6-oxohexanamido)piperidine-1-carboxylate (step 1) (130 mg, 0.283 mmol) in THF (3 mL)/water (1 mL) was added LiOH.H2O (26.1 mg, 0.623 mmol) and the reaction mixture stirred at RT for 3 hrs. The resulting mixture was diluted with water and EtOAc and the aqueous portion acidified with 0.1 M HCl solution (pH 5-6). The resulting precipitate was collected by filtration and washed with water to afford the title product;
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