[C:1]1([CH2:7][CH2:8][CH2:9][NH:10][C:11]2[CH:20]=[CH:19][C:14]3[NH:15][C:16](=[O:18])[O:17][C:13]=3[CH:12]=2)[CH:6]=[CH:5][CH:4]=[CH:3][CH:2]=1.[ClH:21]>CO>[ClH:21].[C:1]1([CH2:7][CH2:8][CH2:9][NH:10][C:11]2[CH:20]=[CH:19][C:14]3[NH:15][C:16](=[O:18])[O:17][C:13]=3[CH:12]=2)[CH:2]=[CH:3][CH:4]=[CH:5][CH:6]=1A methanol solution (40 ml) containing 3.06 g of 6-(3-Phenylpropylamino)-2-benzoxazolone was combined with an ethereal solution saturated with gaseous hydrogen chloride (40 ml) at ice-bath temperature. The resulting solid was collected by filtration, washed with ether and dried to give the title compound (3.470 g).
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