| http://www.w3.org/ns/prov#value | - The salt preferably has the formula R4 --NH(R6)+ --(CH2 CH2 O)y --H+R5 COO- where R4 is an alkyl radical of from 10 to 18 carbon atoms, R5 is an alkyl radical of from 1 to 4 carbon atoms, R6 is hydrogen or (CH2 CH2 O)y and y is from 2 to 16.
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