Homovanillic Acid

**Definition:** A 3-O-methyl ETHER of (3,4-dihydroxyphenyl)acetic acid.

**Tree numbers:** - D02.241.223.601.521

**Synonyms:** - 3-Methoxy-4-Hydroxyphenylacetic Acid - 4-Hydroxy-3-Methoxyphenylacetic Acid