During my literature research on cofactors I have found a cofactor in publication 17516659, which appears not to be in Chebi yet. Its name is MIO (4-methylideneimidazole-5-one) and I suggest to introduce it to Chebi as a child of polypeptide-derived cofactor (CHEBI:36079), since it is built from the peptide motif Ala-Ser-Gly by autocatalysis.