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6-Membered Heterocyclic Compounds [Chemical Structural Class]
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Acridines [Chemical Structural Class]
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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]
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Quinazolines [Chemical Structural Class]
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