[C:1]([N:8]([CH2:12][CH2:13][OH:14])[CH2:9][CH2:10][OH:11])([O:3][C:4]([CH3:7])([CH3:6])[CH3:5])=[O:2].C(N(CC)CC)C.Cl[C:23](Cl)([O:25]C(=O)OC(Cl)(Cl)Cl)Cl>ClCCl>[C:1]([N:8]1[CH2:9][CH2:10][O:11][C:23](=[O:25])[O:14][CH2:13][CH2:12]1)([O:3][C:4]([CH3:6])([CH3:7])[CH3:5])=[O:2]The procedure of Example 1 was followed using N-boc diethanolamine (3 g, 14.6 mmol), triethylamine (4.1 mL, 29.2 mmol), dry dichloromethane (100 mL) and triphosgene (1.4 g, 4.9 mmol). The filtrate was concentrated yielding only oligomeric compounds.
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