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Proposed biosynthetic pathways featuring (A) an NcsF2-catalyzed formation of an (S)-vicinal diol intermediate from an (S)-enediyne core epoxide precursor for NCS (1) and (B) an SgcF-catalyzed formation of a (R)-vivinal diol intermediate from an (S)-enediyne core epoxide precursor for C-1027 (2). The vicinal diol moieties in 1 and 2 concerned in this study are shaded.
