A catecholamine hormone and neurotransmitter; as a hormone, secreted by the adrenal gland in response to stress (when it stimulates the autonomic nervous system); as a neurotransmitter, synthesized from norepinephrine.
How often have the words 5-β-trihydroxy-N-methylphenethylamine and epinephrine occurred in a corpus of books? (source: Google Ngram Viewer )