SEARCH Articles Figures Tables Aromatic Chromophores with P or As Hetero-atom(s) Aromatic Chromophores with S and N Hetero-atoms Five-Membered Heterocycles with Four Hetero Atoms Five-Membered Heterocycles with One Hetero Atom Five-Membered Heterocycles with Three Hetero Atoms Five-Membered Ring Heterocycles with Two Hetero Atoms Five-membered ring heterocyclics with two or more hetero-atoms Hetero-atoms Heterocycles with two hetero-atoms Heterocyclics with 1 hetero atom other Heterocyclics with 1 hetero atom other than Heterocyclics with 3 hetero atoms Indoles with 1 hetero atom other Other Aromatic Chromophores with N Hetero-atoms Problems with Hetero-atoms Schmitz, E„ Three-Membered Rings with Two Hetero Atoms Three-membered rings, with two hetero atoms With 2 different hetero atoms With 2 hetero atoms other With 2 hetero atoms other than With 4 or more hetero atoms