| http://www.w3.org/ns/prov#value | - These agents may be represented by the general formula: wherein Ar stands for an aromatic hydrocarbon radical of the benzene series, n stands for a whole number such as 1, 2 or 3, X stands for an alkalimetal such as sodium or potassium, and R stands for an aliphatic hydrocarbon chain containing from 10 to 18 carbon atoms.
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