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Top: Acid-induced stereoselective isomerization of FCC 3 to the NCC 4 parallels the biomimetic isomerization of FCC epi-3 to NCC epi-4.[5] Bottom: UV/Vis spectral (left, —: trace at t = 0 min and -----: trace at t = 427 min) and kinetic analysis (right) of the isomerization of 3 to 4 observed at room temperature and pH 5.
