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