| http://www.w3.org/ns/prov#value | - Most preferably, the nitrogen-containing compound is selected from the group consisting of polyethylenimine, 1,3-diamino-2-propanol, iminodiacetic acid, 2-amino-1-butanol, ethylenediamine, aminoethylethanolamine, 2,2???-aminoethoxyethanol, and mixtures thereof. [0022] ???Heteroatom??? is defined herein as any atom other than carbon and hydrogen atoms.
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