prov:value
| - V 270-460 9.000 wherein R is an oxygen atom, a sulfur atom, or a nitrogen atom containing an alkyl group having 1 to 12 carbon atoms; R R R and R are hydrogen, alkyl, substituted alkyl, cycloalkyl, substituted cycloalkyl, aryl, substituted aryl, alkyl aryl, aryl substituted aryl, alkoxy, amino, carboxy and the substituents R and R R and R R and R combined with the carbon atoms 3.
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