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(a) Mass spectrum of the dimethyl derivative of metabolite no. 4, 6-oxo-2-hydroxy-7-(4-chlorophenyl)-4,8,8-trichloroocta-2,4-dienoic acid. (b) Mass spectrum of the dimethyl derivative of metabolite no. 4 obtained by selected ion monitoring at m/z 408, 410, 412, 414, and 416.
