| http://www.w3.org/ns/prov#value | - A compound having the formula ##STR6## wherein R is a radical consisting of 4-22 carbon atoms chosen from the group consisting of alkyl, alkenyl and arylalkenyl, which can besubstituted by carboxy, alkoxycarbonyl, hydroxy, cyano, chlorine, bromine or sulfonato groups; andM is chosen from the group consisting of alkali metal, pyridinum or ammonium.2.
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