| http://www.w3.org/ns/prov#value | - of the general formula R1 RQSb Rs in which R is a radical selected from the group consisting of hydrogen, alkyl radicals containing from 1 to 12. carbon atoms, aralkyl, aryl and alkaryl and R and R are the same or different radicals selected from the group consisting of alkyl radicals containing 1 to 12 carbon atoms, ar-alkyl, aryl and alkaryl radicals. 5.
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