Provided are compounds which generally have a triketone structure. Examples of the compounds include derivatives of 1,3-cyclohexanedione, such as: 1,3-cyclohexanedione, 2-propanoyl-5-cyclohexyl-; 1,3-cyclohexanedione, 2-propanoyl-5-[4-fluorophenyl]-; 1,3-cyclohexanedione, 2-acetyl-5-[thien-2-yl]-; 1
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