... ) 99% Synonyms:Propyl gallate, propyl ester of gallic acid, n-propyl ester of 3,4,5-trihydroxybenzoic acid, propyl 3,4,5-trihydroxybenzoateMolecular Formula ... .5% max , 110 oC for 4hSulfated ash0.1% maxFree Acid (as Gallic Acid)0.5% maxChloride Organic compounds (as CL)100mg/kg ...