Synonyms: Reactive Blue 4; Procion Brilliant Blue MR; Helaktyn Pure Blue FR; Procion blue MX-R; C.I. Reactive Blue 4; 13324-20-4;1-amino-4-[3-[(4,6-dichloro-1,3,5-triazin-2-yl)amino]-4-sulfoanilino]-9, 10-dioxoanthracene-2-sulfonic acid; Procion Brilliant Blue RS;