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The oxidized form of vitamin-C has the same side chain as the reduced form of vitamin-C. The side orientation is governed by the torsional angles of the carbon skeleton involving two C–C dihedral angles denoted by Φ and Ψ. The relaxed potential energy surface (PES) were generated at the RHF/3-21G level of theory. Ab inito conformational studies were carried out on all the local and global minima of...