6-Membered Heterocyclic Compounds [Chemical Structural Class]

1,3-Dioxanes [Chemical Structural Class] 1,4-Dioxanes [Chemical Structural Class]

3-Aminopiperidine [Chemical Structural Class] N-Substituted Piperidines [Chemical Structural Class] Piperidinium Salts [Chemical Structural Class]

Benzopyrans [Chemical Structural Class] Chromones [Chemical Structural Class] Coumarins [Chemical Structural Class] Monocyclic Pyrans [Chemical Structural Class] Xanthenes [Chemical Structural Class]

Alkoxypyrazines [Chemical Structural Class] Alkylpyrazines [Chemical Structural Class] Chloropyrazines, etc. [Chemical Structural Class] Phenazines [Chemical Structural Class] Pyrazinecarboxylic Acids [Chemical Structural Class] Quinoxalines [Chemical Structural Class]

Phthalazines [Chemical Structural Class] Pyridazines (Others) [Chemical Structural Class]

Acridines [Chemical Structural Class] Bromopyridines [Chemical Structural Class] Chloropyridines [Chemical Structural Class] Fluoropyridines [Chemical Structural Class] Iodopyridines [Chemical Structural Class] Isoquinolines [Chemical Structural Class] Pyridine N-Oxides [Chemical Structural Class] Pyridinium Salts [Chemical Structural Class] Quinolines [Chemical Structural Class] Viologens [Chemical Structural Class]

Cytosines [Chemical Structural Class] Pteridins [Chemical Structural Class] Purines [Chemical Structural Class] Pyrimidines (Condensed Cyclic) [Chemical Structural Class] Pyrimidines (Monocyclic) [Chemical Structural Class] Quinazolines [Chemical Structural Class] Uracils [Chemical Structural Class]

Chromans [Chemical Structural Class] Condensed Cyclic Tetrahydropyrans [Chemical Structural Class] Monocyclic Tetrahydropyrans [Chemical Structural Class]

1,2,3-Triazines [Chemical Structural Class] 1,2,4-Triazines [Chemical Structural Class] 1,3,5-Triazines [Chemical Structural Class]