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C 9H 13NO 2
Except where otherwise noted, data are given for materials in their
(at 25 °C [77 °F], 100 kPa).
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3-Methoxytyramine ( 3-MT), also known as 3-methoxy-4-hydroxyphenethylamine, is a human trace amine that occurs as a metabolite of the neurotransmitter dopamine. It is formed by the introduction of a  methyl group to dopamine by the enzyme catechol-O-methyl transferase (COMT). 3-MT can be further metabolized by the enzyme monoamine oxidase (MAO) to form homovanillic acid (HVA), which is then typically excreted in the urine.
Originally thought to be physiologically inactive, 3-MT has recently been shown to act as an
agonist of human TAAR1. 
3-Methoxytyramine occurs naturally in the
prickly pear cactus (genus Opuntia), and is in general widespread throughout the  Cactaceae. It has also been found in  crown gall tumors on Nicotiana sp.
In humans, 3-methoxytyramine is a
trace amine that occurs as a metabolite of dopamine.
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