Heterocycles
Heterocycles are cyclic compounds that contain elements other than carbon in the ring. Typicality nitrogen, oxygen, or sulfur.
Pyridine is a solvent and industrial chemical, colorless to yellow liquid with a nauseating, fish-like odor. It is quite toxic. Furan is a laboratory solvent and industrial chemical.
Heterocycles can be fused, as in
Purine and another heterocycle,
are
bases (not acids) and are components from which the DNA molecules, the genetic
material in all life forms, derives. More on these soon.
The above gave you, I hope, some basic vocabulary about organic chemistry.
END of SUB-MODULE