Cl.[C:2]([O:6][C:7](=[O:12])[CH2:8][CH2:9][CH2:10][NH2:11])([CH3:5])([CH3:4])[CH3:3].[Cl:13][C:14]1[CH:15]=[C:16]([CH:38]=[CH:39][C:40]=1[Cl:41])[CH2:17][N:18]1[CH2:23][CH2:22][O:21][C@@H:20]([CH2:24][NH:25][C:26](=O)[O:27]C2C=CC([N+]([O-])=O)=CC=2)[CH2:19]1.C(N(CC)C(C)C)(C)C.C(=O)([O-])[O-].[K+].[K+]>ClCCl>[Cl:13][C:14]1[CH:15]=[C:16]([CH:38]=[CH:39][C:40]=1[Cl:41])[CH2:17][N:18]1[CH2:23][CH2:22][O:21][C@@H:20]([CH2:24][NH:25][C:26]([NH:11][CH2:10][CH2:9][CH2:8][C:7]([O:6][C:2]([CH3:5])([CH3:3])[CH3:4])=[O:12])=[O:27])[CH2:19]14-Aminobutyric acid tert-butyl ester hydrochloride (0.235 g) was added to a stirred solution of Intermediate 13 (0.440 g) and N,N-diisopropylethylamine (0.42 ml) in dry dichloromethane (20 ml) under nitrogen, and the mixture was stirred at 22° C. for 18 h. The mixture was treated with saturated aqueous potassium carbonate (20 ml) and stirred for 5 min. The layers were separated and the organic layer applied to a silica gel cartridge (10 g Varian Bond Elut). Elution with dichloromethane, ether, ethyl acetate, and acetone gave the crude product (0.357 g). Further purification by chromatography on silica gel (10 g Varian Bond Elut cartridge), eluting with dichloromethane (1 column volume), ether (4 column volumes) and ethyl acetate (8 column volumes) gave the title compound as a gum (0.345 g).
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