MNDO/GIAO perturbation calculation of <sup>13</sup>C and <sup>19</sup>F magn

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The basic approximation of the MNDO method is applied to the SCF-MO theory of nu-clear magnetic shielding constants.Gauge-invariant atomic orbitais(GIAO)and derived equations are used to cal-culate NMR chemical shifts.A more simple and effective calculati
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