homoprotocatechuic acid

ho·mo·pro·to·cat·e·chu·ic ac·id

(hō'mō-prō'tō-kat'ĕ-chū'ik as'id),
(3,4-dihydroxyphenyl)acetic acid; an isomer of homogentisic acid found in urine; a degradation product of l-tyrosine, l-dopa, and hydroxytyramine.
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Five other metabolites derived from verbascoside and isoverbascoside were also found in plasma, namely hydroxytyrosol, caffeic acid, ferulic acid, ferulic acid glucuronide, and homoprotocatechuic acid, together with another eight phenolic compounds.
Five metabolites deriving from verbascoside and isoverbascoside were also found in plasma due to the metabolism of the rats, namely hydroxytyrosol, caffeic acid, ferulic acid, ferulic acid glucuronide, and homoprotocatechuic acid.
Homoprotocatechuic acid has been also described as a metabolite of caffeic acid (Gonthier et al.