C(OC([NH:8][CH:9]1[CH2:18][CH2:17][C:16]2[C:11](=[CH:12][C:13]([CH:19]=[CH:20][C:21]([O:23][CH2:24][CH3:25])=[O:22])=[CH:14][CH:15]=2)[CH2:10]1)=O)(C)(C)C.[ClH:26]>C(O)C>[ClH:26].[NH2:8][CH:9]1[CH2:18][CH2:17][C:16]2[C:11](=[CH:12][C:13]([CH:19]=[CH:20][C:21]([O:23][CH2:24][CH3:25])=[O:22])=[CH:14][CH:15]=2)[CH2:10]1A solution of the compound obtained in step d) above (2.7 g, 0.0078 mol) in absolute ethanol (50 ml) is allowed to react at room temperature for 5 hours with 4N HCl absolute ethanol (33 ml).
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