[C:1]([O:5][C:6]([NH:8][CH2:9][C@H:10]([CH2:14][C:15]1[CH:20]=[C:19]([Cl:21])[CH:18]=[CH:17][C:16]=1[O:22][CH3:23])[C:11](O)=[O:12])=[O:7])([CH3:4])([CH3:3])[CH3:2].C(N1C=CN=C1)([N:26]1C=CN=C1)=O.O.N.O>O1CCCC1.C(OCC)(=O)C>[NH2:26][C:11](=[O:12])[C@@H:10]([CH2:14][C:15]1[CH:20]=[C:19]([Cl:21])[CH:18]=[CH:17][C:16]=1[O:22][CH3:23])[CH2:9][NH:8][C:6](=[O:7])[O:5][C:1]([CH3:4])([CH3:3])[CH3:2]
(Step 3) To (2S)-3-[(tert-butoxycarbonyl)amino]-2-(5-chloro-2-methoxybenzyl)propanoic acid (30 g) in tetrahydrofuran (150 ml) solution, 1,1′-carbonyldiimidazole (15.6 g) was added under ice cooling and the mixture was stirred at room temperature for 1 hour. The reaction solution was cooled to 0° C., 28% ammonia water (30 ml) was added, and the mixture was stirred at room temperature for 30 minutes. Distilled water and ethyl acetate were added to the reaction solution, the aqueous layer and the organic layer were separated, and the aqueous layer was extracted with ethyl acetate. The combined organic layer was successively washed with saturated potassium hydrogensulfate aqueous solution and saturated saline, dried over with anhydrous sodium sulfate, then concentrated. Hexane and ethyl acetate were added to the precipitated solid and the mixture was stirred in the suspended state at room temperature. The precipitated solid was collected by filtration to obtain the title compound (29.2 g).
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