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Plot of potential energy (kcal mol−1), corresponding to conformation B, against (a) the change in the O1–C5, O1–H4 and C5–H4 distances (Å) for proton transfer to O1 and (b) the change in the O2–C5, O2–H4 and C5–H4 distances (Å) for proton transfer to O2.
