SEARCH Articles Figures Tables Costero, A. M., The Chemistry of Unsaturated Nitrogen Heterocyclic Compounds Heterocyclic compounds unsaturated five-membered Of unsaturated nitrogen heterocyclic compounds containing carbonyl Partially Unsaturated Heterocyclic Compounds Unsaturated nitrogen heterocyclic compounds Unsaturated nitrogen heterocyclic compounds containing carbonyl groups Unsaturated nitrogen heterocyclic compounds containing carbonyl groups, chemistry