Abstract
The author observed an important photochemical reaction of lyochrome (flavin). The primary photo reaction is a hydrogen displacement. In urine 3 more lyo-chromes have been observed other than uroflavin. One of these is in comparison to aqua flavin. The new lyochrome found only in urine may be a metabolism product from known lyochromes. Positive results have not been obtained through oxidation of uroflavin. The system: lyochrom-light, hydrogen donator (sulfites, etc.) with the carbonic acid as the final H acceptor may be seen as a ferment model.

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