<unk>  is a catecholamine and a phenethylamine. Its structure differs from that of epinephrine only in that epinephrine has a methyl group attached to its nitrogen, whereas the methyl group is replaced by a hydrogen atom in<unk> . The prefix nor- is derived as an abbreviation of the word "normal", used to indicate a demethylated compound.
Norepinephrine
Dopamine 
Dopamine
Synephrine
Adrenomedullin
Octopamine
Catecholamine
Adrenaline