prov:value
| - R3 is a radical selected from the group consisting of hydrogen, C1 -C6 alkyl, hydroxy C1 -C6 alkyl, polyhydroxy C1 -C6 alkyl, phenyl, phenyl-C1 -C6 alkylene, C1 -C6 alkylphenyl, C1 -C6 alkoxyphenyl, halophenyl, trifluoromethylphenyl, hydroxy, oxo (O???), C1 -C6 alkoxy, phenyl-C1 -C6 alkoxy, halo, mercapto, thioxo (S???), C1 -C6 alkylthio, phenyl-C1 -C6 alkylthio, C1 -C6 alkanoyl (C1 -C6 acyl), C1
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