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Wiktionary
tyramine

n. (context chemistry English) a phenolic amine, 4-hydroxy-phenethylamine, derived from the amino acid tyrosine, found in various foodstuffs and used as a sympathomimetic agent

WordNet
tyramine

n. amino acid derived from tyrosine; has a sympathomimetic action; found in chocolate and cola drinks and ripe cheese and beer; "patients taking MAOIs should avoid foods containing tyramine"

Wikipedia
Tyramine

Tyramine , also known by several other names, is a naturally occurring monoamine and trace amine derived from the amino acid tyrosine. Tyramine acts as a catecholamine releasing agent. Notably, it is unable to cross the blood-brain barrier, resulting in only non-psychoactive peripheral sympathomimetic effects. A hypertensive crisis can result, however, from ingestion of tyramine-rich foods in conjunction with monoamine oxidase inhibitors (MAOIs).

Usage examples of "tyramine".

Cee had been almost hopeful when the tyramine seemed within their grasp.

But you also get tyramine in yeast extract, brewer's yeast, and meat extracts such as Marmite or Oxo.