n = 4
glycine (C1-N7 ){ 0.18963[Sσ] , -0.33054[Rσ] , 0.17961[Sσ]}
glycine (C1-C2 ){ 0.05690[Sσ] , -0.01130[Rσ] , 0.00133[Sσ]}
We now present the quantification of the chirality Cσ, which is defined in terms of the most preferred component,e.dr → bond-twist, for the CCW and CW torsions. The presence of a positive value for the glycine chirality Cσ demonstrates that Sσcharacter dominates over Rσ character for the Tσ(s ) of the dominant torsional C1-N7 BCP , see Table 1(a) . This is because the CCW torsion occurs more readily, which is apparent from thee.dr component being 5.51% larger than that of the CW torsion, see Table 1(a) . The corresponding value of the chirality Cσ for the torsional C1-C2BCP also demonstrates Sσ character, where the CCW e.dr component is 3.16 % larger than the CW e.dr component, see Table 1(b) . For the glycine torsional C1-C2 BCP the chirality Cσ = 0.057, bond-flexing Fσ = -0.011 and the bond-anharmonicity Aσ = 0.0013, seeTable 2(b) . Although these values are small compared to the Cσ, Fσ and Aσ values of the stronger torsional bond, i.e. the torsional C1-N7 BCP , they are more comparable to Cσ = 0.078 and Aσ= 0.003 of the torsional C1-C2 BCP of the S-stereoisomer of lactic acid and Fσ = -0.030 of the R-stereoisomer of alanine, compare Table 1(b) with Table 2(b) . For lactic acid the S-stereoisomer possesses a larger value of Cσ than the R-stereoisomer, consistent with earlier work[30], see Table 2(b) . The corresponding Cσ results for the alanine torsional C1-C2 BCPindicate a preference for the R-stereoisomer, in keeping with experiment[60].