[OH:1][C:2]1[CH:3]=[C:4]2[C:8](=[CH:9][CH:10]=1)[N:7]([CH2:11][CH2:12][CH2:13][CH2:14][CH3:15])[CH:6]=[C:5]2[C:16]([C:18]1[C:27]2[C:22](=[CH:23][CH:24]=[CH:25][CH:26]=2)[CH:21]=[CH:20][CH:19]=1)=[O:17].[C:28]([OH:34])([C:30](F)(F)F)=[O:29]>ClCCl>[C:28]([CH2:30][O:1][C:2]1[CH:3]=[C:4]2[C:8](=[CH:9][CH:10]=1)[N:7]([CH2:11][CH2:12][CH2:13][CH2:14][CH3:15])[CH:6]=[C:5]2[C:16]([C:18]1[C:27]2[C:22](=[CH:23][CH:24]=[CH:25][CH:26]=2)[CH:21]=[CH:20][CH:19]=1)=[O:17])([OH:34])=[O:29]To a solution of 7 (3.0 g, 6 4 mmol) in dichloromethane (50 ml) was added TFA (25 ml) and the mixture was stirred at room temperature for 3 h. The mixture was evaporated to dryness and the crude obtained was purified by chromatography on silica-gel using 5% methanol in chloroform to give Hapten-B (2.1 g, 79%).
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