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Negative ion electrospray UHPLC-MS/MS selected reaction monitoring chromatograms of flavonolignans, flavanonol taxifolin, and deuterated internal standards daidzein and genistein. (A) Standards at 256 ng/mL in 50% aqueous methanol; (B) internal standards at 100 ng/mL; and (C) silymarin (10 μg/mL) extracted from milk thistle seed.
