4,4'-Tetramethyldiamino-4''-methoxytriphenylmethane-3''-sulfonic acid sodium salt 6310-59-4 Benzenesulfonic acid, 5-[bis[4-(dimethylamino)phenyl]methyl]-2-methoxy-, sodium salt NSC43921 m-Toluenesulfonic acid, .alpha.,.alpha.-bis[p-(dimethylamino)phenyl]-6-methoxy-, sodium salt