Involutin is an organic compound that can be found in mushrooms belonging to the genus Paxillus. It is part of a class of compounds known as diarylcyclopentenones. It is derived from atromentin which was shown from 3â²,3â³,5â²,5â³-d4-atromentin (deuterated atromentin) feeding studies and observing the deuterated incorporation into two atromentin derivatives (i.e., an increase in monoisotopic mass by 4 mass units), gyrocyanin and its oxidation product gyroporin. It has been shown to be a Fe<sup>3+</sup>-reductant and presumed to be involved in Fenton chemistry for the initial attack of dead plant matter.