SEARCH Articles Figures Tables 2- pyrroles pyrimidine Heterocycles pyridine Heterocycles pyrimidines Heterocycles pyrroles Heterocyclic compounds Pyrrole Heterocyclic compounds pyridine Heterocyclic compounds pyrimidines Heterocyclic compounds pyrroles Heterocyclics pyridines Heterocyclics pyrroles Pyridine 2- pyrimidine Pyridine compounds Pyrrole compounds Pyrroles, Pyridines