Trihydroxybenzoic acid

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