4XLO:
reference: Flavin-mediated dual oxidation controls an enzymatic Favorskii-type rearrangement., Teufel R, Miyanaga A, Michaudel Q, Stull F, Louie G, Noel JP, Baran PS, Palfey B, Moore BS, Nature. 2013 Nov 28;503(7477):552-6. doi: 10.1038/nature12643. Epub 2013 Oct 27. PMID: 24162851

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