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Dihedral angle ξ measures planarity of gly molecule. If ξ ~ 0°, the molecule is planar and the C-H bonds are symmetric with respect to the carboxyl group plane, as in case of Gly•HCl. In Gly•HNO3 the carboxyl is rotated ~ 21° with respect to the N1-C3 bond making the C-H bonds nonequivalent.
