The melatonin metabolite N-acetyl-5-methoxykynuramine is a potent singlet oxygen scavenger.

@article{Schaefer2009TheMM,
  title={The melatonin metabolite N-acetyl-5-methoxykynuramine is a potent singlet oxygen scavenger.},
  author={Meike Schaefer and R{\"u}diger Hardeland},
  journal={Journal of pineal research},
  year={2009},
  volume={46 1},
  pages={49-52}
}
Singlet oxygen was generated by means of rose bengal under irradiation by visible light. N(1)-acetyl-5-methoxykynuramine (AMK) was rapidly destroyed by this reactive oxygen species, whereas its formylated precursor, N(1)-acetyl-N(2)-formyl-5-methoxykynuramine (AFMK), was remarkably inert. At photon fluence rates of 1400 mumol photons/m(2)s, and using 20 mum rose bengal, most of initially 0.2 mm AMK was destroyed within 2 min, whereas AFMK remained practically unchanged for much longer periods… CONTINUE READING
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