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EPR spectra of 4-chlorobiphenyl-2′,5′-semiquinones in 50% glycerol content, and 2-fluoro-4-chlorobiphenyl-2′,5′-semiquinone comparing with the typical 4-chlorobiphenyl-2′,5′-semiquinone signals derived from 4-chlorobiphenyl-2′,5′-benzoquinones.
