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Conformational stability of various 5-substituted orotic acid derivatives was studied by applying linear free energy relationships (LFER) to the 13 C NMR chemical shifts. The correlation analysis for the substituent-induced chemical shifts (SCS) with inductive (r I ), and various resonance (r R ) parameters were carried out through Single Substituent Parameter (SSP) and Dual Substituent Parameter (DSP) methods, and multiple regression analysis. Good Hammett correlations for all carbons weredoi:10.1016/j.arabjc.2015.08.014 fatcat:p3o2tneij5ez7m6corkrn3kv2e