There are no works in theoretical of a statistical method of NICS-nucleus independent chemical shift for study of heterocyclic rings , since the asymmetry 15 (h) and skew 15 (k) parameter is fluctuated in small distance and are alternate in large distance in the center of heterocyclic rings . Through changing the asymmetries among 0< h< +1 skew 15 could be changed in the range of -1
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