[F:1][C:2]([F:21])([F:20])[CH2:3][C:4]1[CH:9]=[CH:8][C:7]([CH:10]2[CH2:15][NH:14][CH2:13][CH:12]([C:16]([O:18][CH3:19])=[O:17])[CH2:11]2)=[CH:6][CH:5]=1.C(N(CC)CC)C.Cl[C:30]([O:32][C:33]1[CH:38]=[CH:37][C:36]([N+:39]([O-:41])=[O:40])=[CH:35][CH:34]=1)=[O:31]>ClCCl>[F:21][C:2]([F:1])([F:20])[CH2:3][C:4]1[CH:9]=[CH:8][C:7]([CH:10]2[CH2:15][N:14]([C:30]([O:32][C:33]3[CH:34]=[CH:35][C:36]([N+:39]([O-:41])=[O:40])=[CH:37][CH:38]=3)=[O:31])[CH2:13][CH:12]([C:16]([O:18][CH3:19])=[O:17])[CH2:11]2)=[CH:6][CH:5]=1A solution of 6.62 g (19.8 mmol, purity 90%) of the compound from Example 53A in dichloromethane (211 ml) was admixed with 9.65 ml (7.00 g, 69.2 mmol) of triethylamine and then admixed at 0° C. with 3.99 g (19.8 mmol) of 4-nitrophenyl chloroformate. The mixture was warmed to RT and stirred for 1 h. The reaction solution was washed with saturated aqueous sodium hydrogencarbonate solution and water, and the organic phase was dried over magnesium sulphate, filtered and concentrated under reduced pressure. Yield: 10.3 g (91% of theory, purity 81%)
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