A molecule containing one amine group. An amine is an organic compound containing nitrogen. The so-called "biogenic monoamines" are natural, biologically active compounds that often function as neurotransmitters, including dopamine, serotonin, noradrenaline, and epinephrine.

derivative of ammonia where one, two, or three of the hydrogen atoms are replaced by alkyl groups of six carbons or less.

An organic compound containing nitrogen in one amino group (NH). Some of the known neurotransmitters of the central nervous system, called collectively brain amines, are catecholamines and indoleamines, which are monoamines.