p,p',p''-tris(dimethylamino)tritylium m-[(p-anilinophenyl)azo]benzenesulphonate;Methylium, tris4-(dimethylamino)phenyl-, salt with 3-4-(phenylamino)phenylazobenzenesulfonic acid (1:1);4,4',4''-Tris(dimethylamino)tritylium 3-[(4-anilinophenyl)azo]benzenes