[Cl:1][CH2:2][CH2:3][N:4]([C:8]1[CH:18]=[CH:17][CH:16]=[CH:15][C:9]=1[C:10]([O:12]CC)=[O:11])[CH2:5][CH2:6][Cl:7].Cl>>[Cl:1][CH2:2][CH2:3][N:4]([C:8]1[CH:18]=[CH:17][CH:16]=[CH:15][C:9]=1[C:10]([OH:12])=[O:11])[CH2:5][CH2:6][Cl:7]Ethyl 2-[N,N-bis(2-chloroethyl)amino]benzoate (950 mg; 3.3 mmol) was added to 15 ml of concentrated hydrochloric acid, followed by stirring for 8 hours under heating and reflux. The solvent was distilled out under reduced pressure and the residue was purified by chromatography on a silica gel column (methylene chloride→acetone), whereby 520 mg of white powder were obtained (yield: 61%).
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