| http://www.w3.org/ns/prov#value | - The compound according to claim 23, wherein R1 is a monosubstituted phenyl selected from the group consisting of 4-azidophenyl, 4-bromophenyl, 4-chlorophenyl, 4-cyanophenyl, 4-ethylphenyl, 4-fluorophenyl, 4-iodophenyl, 4-(phenylcarbonyl)-phenyl, and 4-(1-ethoxy)ethylphenyl.
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