| http://www.w3.org/ns/prov#value | - B represents any substituent, for example, preferably, a carboxyl group or the group represented by the following formula: ##STR35## in which D represents --OR4, --COOR4 or --OCO--R4 wherein R4 in the substituent D each represents hydrogen or substituted or unsubstituted alkyl group such as methyl or ethyl, and
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