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Electrospray ionization tandem mass spectrometry (ESI/MS/MS) spectra from protonated isorhamnetin metabolite [M+H]+ ions. (a) Protonated isorhamnetin triglucuronide sulphate [IG3S+H] at m/z=925; (b) protonated isorhamnetin diglucuronide disulphate [IG2S2+H] at m/z 829; (c) protonated isorhamnetin diglucuronide [IG2+H] at m/z 669 and (d) protonated isorhamnetin glucuronide disulphate [IGS2+H] at m/z 653.
