C. I. Reactive red 236

3-Carboxy-1-[4-[4-chloro-3-sulfophenyl)amino]-6-[[5-hydroxy-6-[(4-methoxy-2-sulfophenyl)azo]-7-sulfo-2-naphthalenyl]amino]-1,3,5-triazin-2-yl]pyridinium hydroxide, trisodium salt