| http://www.w3.org/ns/prov#value | - wherein R1 is hydrogen or a halogen atom, R2 and R3 are the same or different and are each hydrogen or an alkyl having 1 to 3 carbon atoms, and one of X and Y is a carbon atom and another is a nitrogen atom, provided that the group ???CH2SO2NR2R3 is bonded to the carbon atom of either of X and Y, or an alkali metal salt thereof, in an amount sufficient to effect said treatment.
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