| http://www.w3.org/ns/prov#value | - (Cn H2n)--, in which R2 is hydrogen or an alkyl group containing 1 to 6 carbon atoms and n has a value of from 2 to 6, R1 is an optionally substituted alkylene group having from 1 to 6 carbon atoms, and hydrates or alkali metal salts thereof.
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