| http://www.w3.org/ns/prov#value | - If necessary, a base is added, for example an alkali metal or alkaline earth metal carbonate or hydroxide, or a tertiary nitrogen base, such as pyridine, 2,6-lutidine, collidine, N-methyl-morpholine, triethylamine, diisopropylethylamine, 4-dimethylaminopyridine or N,N-dimethyl-aniline.
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