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| - The term halogen represents fluorine, chlorine, bromine and iodine, and the term lower alkyl group represents a straight-chain or branched-chain alkyl group having 1 to 4 carbon atoms such as methyl group, ethyl group, propyl group, isopropyl group, butyl group, isobutyl group, sec-butyl group, tert-butyl group, or the like.
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