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Mass spectroscopy analysis of daidzein hydroxylation from Bacillus subtilis Roh-1 and the chemical structures of TMS derivatives. (A) Mass spectra of metabolite, 7,3',4'-trihydroxyisoflavone; (B) Mass spectra of metabolite, 7,8,4'-trihydroxyisoflavone; (C) Mass spectra of metabolite, 6,7,4'-trihydroxyisoflavone; (D) Mass spectra of metabolite, glycitein.
