| http://www.w3.org/ns/prov#value | - neral formula [V] below; ##STR34## or a group represented by the general formula [VI]; ##STR35## wherein R9, R10 and R12 are respectively an alkyl group, an aralkyl group or an aryl group; R11 and R13 are respectively a hydrogen atom, an alkyl group, an aralkyl group or an aryl group; Ar is an aryl group or a residual group of heterocyclic ring; n1 is zero or an integer of more than 1.
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