A [2.1.0]-Fused Bicyclic Intermediate Is Produced during the Biosynthesis of Oxetane Nucleosides - Yu-Hsuan Lee; Po-Hsun Fan; Yu-Cheng Yeh; Mark W. Ruszczycky; Yujie Geng; Aoshu Zhong; Hung-wen Liu (Journal of the American Chemical Society, 2025)