Heterocyclic compounds 43 ADVANCES IN HETEROCYCLIC CHEMISTRY 21 Chemistry 20 Heterocyclic chemistry 15 HETEROCYCLIC CHEMISTRY 8 Chemistry, Organic 7 Dissertations, Academic (Ph.D) 7 Heterocyclic Compounds 7 Thesis (Ph.D)-Chemistry 7 Alicyclic & heterocyclic compounds-- Organic chemistry 6 Organic chemistry 6 Heterocyclic compounds-Synthesis 5 Ring formation (Chemistry) 5 HETEROCYCLIC COMPOUNDS 4 Heterocyclic 4 Organic compounds 4 Aromatic compounds 3 Carbon compounds 3 Heterocycles 3 Organic reaction mechanisms 3 Synthesis 3 Aliphatic compounds 2 Carbenes (Methylene compounds) 2 Carbohydrates 2 Chemistry, Inorganic 2 HECTROCYCLIC CHEMISTRY 2 Mass spectrometry 2 Monoheterocyclic 2 Organic Chemistry 2 Organosulfur compounds 2