prov:value
| - Examples of compounds containing chalcone, propenone, and pentadienone groups are those containing structures of formula ##STR6## or ##STR7## where each R8 is a halogen atom, or an alkyl, cycloalkyl, alkenyl, cycloalkenyl, alkoxy, cycloalkoxy, alkenoxy, cycloalkenoxy, carbalkoxy, carbocycloalkoxy, carbalkenoxy, or carbocycloalkenoxy group, such organic groups containing 1 to 9 carbon atoms, or is
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