prov:value
| - wherein when R1 is a substituted alkyl, the alkyl group can further bear one or more substituents selected from alkoxy, mercapto, cycloalkyl, substituted cycloalkyl, heterocyclic, substituted heterocyclic, aryl, substituted aryl, heteroaryl, substituted heteroaryl, aryloxy, substituted aryloxy, cyano, nitro, amino, amido, ???C(O)H, acyl, oxyacyl, carboxyl, sulfonamide, and sulfuryl;
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