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CeNA in its two stable conformations: (A) the 2H3 half-chair conformation which mimics the C2′-endo conformation of the natural ribose sugar and (B) the 3H2 half-chair conformation mimicking the C3′-endo conformation. (C) The CeNA in the 2E-envelope conformation. (D) Numbering scheme used for the CeNA cyclohexene ring.
