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Overall mechanism of the polycyclization reaction of SHCs and structures of squalene cyclization products. (A) The polycyclization reaction of squalene to hopene by SHCs (modified from reference 89). (B) Structures of other squalene polycyclization products: hopanol (1), tetrahymanol (by squalene-tetrahymanol cyclase) (2), and minor hydrocarbons generated from squalene by A. acidocaldarius SHC (3–7).
