| http://www.w3.org/ns/prov#value | - o about 24 carbon atoms, preferably about 12 to about 20 carbon atoms in the alkyl chain, R' is ethyl, propyl or a mixture of ethyl and propyl, preferably ethyl, n has an average value of about 1 to about 20, preferably about 2 to about 5, R is ethyl, propyl, hydroxypropyl or butyl and M is an alkali metal or ammonium cation.
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