Synonym(s): 3-Hydroxy-4-(2-hydroxy-4-sulfo-1-naphthylazo)-2-naphthalenecarboxylic acid, Patton and Reeder's Reagent Formula: C21H14N2O7S Formula weight: 438.42 Purity: 94% (dry wt.), water CAS Number: 3737-95-9 Harmonized Tariff Code:  2927.00 Hazard Statements: H315-H319-H335 …