| http://www.w3.org/ns/prov#value | - [wherein R10 and R11 are each independently a hydrogen atom, a lower alkyl group, an aryl group or a carboxyl group; R12 is a hydrogen atom, an alkyl group, a lower haloalkyl group, a lower hydroxyalkyl group, an aryl group, a lower alkoxycarbonyl group, a carboxyl group, a group shown by the general formula [28]:
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