Biosynthesis of γ-Alkylidenebutenolide Derivatives Reveals an Atom-Deleting Lactone Ring Contraction by Dual-Enzyme Cascade - Cuiping Li; Yuzhuang Fu; Lijie Zhu; Qunyan Jiang; Liang Gu; Yucheng Zhao; Minghua Yang; Lingyi Kong (Journal of the American Chemical Society, 2025)