| http://www.w3.org/ns/prov#value | - ctively 0-7; and r is 0 or 1.Further, preferred examples of the compounds represented by the above-mentioned general formula (II) may include those represented by the following formulas (II-a) to (II-q). ##STR36##In the formulas (II-a) to (II-q), R.sub.3, R.sub.4, X.sub.3 and X.sub.4 are respectively the same as in the general formula (II).
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