SEARCH Articles Figures Tables 2- Substituted 1,3-azoles, tautomerism 2-Methyl-5 -substituted benzimidazoles tautomerism 3- Substituted isothiazoles, tautomerism 3- Substituted triazoles, tautomeric structure 3-Substituted isoxazoles, tautomerism 3-Substituted pyrazoles, tautomerism 5 -Substituted benzimidazoles, tautomerism 5- -substituted-barbituric acids tautomerism 5-Substituted tetrazoles, annular tautomerism 5-Substituted tetrazoles, tautomerism 9-Substituted adenines, tautomerism Isothiazole substituted, tautomeric forms Ring-chain tautomerism substitution, nucleophilic Substituted 2-hydroxypyridines. tautomerism Substituted 4- quinolines tautomerism Tautomerism in Substituted Nitroethylenes