Heterocycles

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Heterocycles are cyclic compounds with at least two different elements as ring members atoms.

Three-membered rings



Four-membered rings

Nitrogen based


Oxygen based


Sulfur based


Other atom based


Multiple heteroatom based


Five-membered rings

Nitrogen based


Oxygen based


Sulfur based


Other atom based


Multiple heteroatom based

N,O-heterocycles


N,S-heterocycles


S,O-heterocycles


Six-membered rings

Nitrogen based


Oxygen based


Sulfur based


Other atom based


Multiple heteroatom based

N,O-heterocycles


N,S-heterocycles


S,O-heterocycles


Seven-membered rings



Eight-membered and more rings



Bicyclic rings



Tricyclic rings



Tetracyclic and more rings