| http://www.w3.org/ns/prov#value | - wherein R1 and R2 are independently alkyl groups comprising 1 to 18 carbons, or hydroxyalkyl groups such as hydroxyethyl or hydroxypropyl groups, R3 is a methyl group, n is an integer in the range of from 2 to 150, m is an integer in the range of from 20 to 2,000, and X??? is a compatible anion, such as fluoride, chloride, bromide, iodide, nitrate, or nitrite.
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