| prov:value
| - d from the group consisting of H, C1-5 acyl, C1-5 acyloxy, C1-4 alkoxy, C1-8 alkyl, C1-4 alkylcarboxamide, C1-4 alkylthiocarboxamide, C1-4 alkylsulfinyl, C1-4 alkylsulfonyl, C1-4 alkylthio, amino, C1-4 alkylamino, carbo-C1-6-alkoxy, carboxamide, carboxy, cyano, C3-6-cycloalkyl, C2-8 dialkylamino, C2-6 dialkylcarboxamide, C1-4 haloalkoxy, C1-4 haloalkyl, halogen, hydroxyl and nitro; or R2 is a grou
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