| http://www.w3.org/ns/prov#value | - aving 1 to 5 carbon atoms, a lower alkoxy group having 1 to 5 carbon atoms, --SO2 Cl, --SO2 Br, ##STR11## --SO3 H or --SO3 R5 ; R3, R4 and R5 are as defined above; the --SO2 Cl or --SO2 Br group may include a quaternary salt thereof; the --SO3 H group may include an ammonium salt thereof, an organic base thereof and a quaternary salt thereof; and p is an integer of 1 to 20.
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