Pyrogallol Tech Grade 99%. Pyrogallol Tech Grade 99% Synonyms:Pyrogallic Acid; 1,2,3-Trihydroxybenzene; 1,2,3-BenzenetriolMolecular Formula:C6H3(OH)3CAS#87-66 ... months in unopened container. 100kg Pyrogallol Tech Grade 99%, Pyrogallic Acid, 1,2,3-Trihydroxybenzene; 1,2,3-Benzenetriol; CAS 87-66-1 ...