| http://www.w3.org/ns/prov#value | - r aralkyl group having 1 to 24 carbon atoms or an alkylene, arylene, or aralkylene group having 1 to 24 carbon atoms, and at least one of R1 and R2 is a group selected from the group consisting of ???SO3???, ???SO3H, ???R35SO3???, ???R35SO3H, ???COOH and ???R35COOH);
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