Trihydroxybenzoic acid may refer to the following phenolic acids: Gallic acid (3,4,5-trihydroxybenzoic acid) Phloroglucinol carboxylic acid (2,4,6-trihydroxybenzoic acid)

O-methylated trihydroxybenzoic acids are: Eudesmic acid Syringic acid

Glycosides: Theogallin