C(OC([N:8]1[CH2:13][CH2:12][N:11]([C:14]2[O:15][C:16]3[CH:22]=[CH:21][CH:20]=[CH:19][C:17]=3[N:18]=2)[CH2:10][CH2:9]1)=O)(C)(C)C.[ClH:23]>O1CCOCC1>[ClH:23].[N:11]1([C:14]2[O:15][C:16]3[CH:22]=[CH:21][CH:20]=[CH:19][C:17]=3[N:18]=2)[CH2:12][CH2:13][NH:8][CH2:9][CH2:10]110.8 mmol of 4-benzoxazol-2-yl-piperazine-1-carboxylic acid tert.-butyl ester were treated with 30 ml of a dioxane, saturated with gaseous hydrochloric acid. The heterogenous mixture was stirred at room temperature for 1 hour, before evaporation of the solvent. This yielded the title compound as a colorless solid.
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