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A) Observed side products 51–56 and 40β. B) Proposed reaction pathways for the formation of 51 and 52. C) Proposed reaction pathways for the formation of 53α and 54α (path A) as well as 55 (path B). D) Proposed reaction pathways for the formation of 53β and 54β (path A) as well as 40β (path C).
