... ,4,5 -Trihydroxy Benzoic Acid,CHEMICAL phosphoric acid Chemical Name: 3,4,5 -Trihydroxy Benzoic AcidPhysical Properties: White ... , dyes, chemicals and organic synthesis, as well as in the analysis of rare metals.GALLIC ACID,3,4,5 -Trihydroxy Benzoic Acid,CHEMICAL phosphoric acid