The molecule is an organic sodium salt resulting from the formal condensation of Pontamine sky blue 5B (acid form) with four equivalents of sodium hydroxide. It has a role as a histological dye, a fluorochrome and a carcinogenic agent. It contains a Pontamine sky blue 5B(4-).
tetrasodium;5-amino-3-[[4-[4-[(8-amino-1-hydroxy-3,6-disulfonatonaphthalen-2-yl)diazenyl]-3-methoxyphenyl]-2-methoxyphenyl]diazenyl]-4-hydroxynaphthalene-2,7-disulfonate