heterocyclic heterocyclic English heterocyclic English heterocyclic aromatic rings English English English English English heterocikla kunmetaĵo en:Heterocyclic compound English heterocyclic heterocyclic en:Heterocyclic compound#Images English English English English heterocyclic rings English English heterocyclic heterocyclic English Wikipedia article "Heterocyclic_compound" heterocyclic English Heterocyclic compound heterocyclic heterocyclic compound English heterocikla kunmetaĵo English English heterocyclic English English English heterocycles English en.wikipedia.org heterocyclic English en:Heterocyclic compound heterocyclic compounds heterocyclic heterocyclic heterocyclic heterocikla kunmetaĵo English heterocyclic English ring structure English heterocyclic English http://en.wikipedia.org/wiki/Heterocyclic_compound heterocyclic heterocyclic English heterocyclic heterocyclic compound