Synonyms: N-[4-[bis[4-(diethylamino)phenyl]methylene]2,5-cyclohexadien-1-ylidene]-N-ethyl -Ethanaminium,6-hydroxynaphthalenesulfonate;2-Naphthalenesulfonic acid, 6-hydroxy-, ion(1-), N-[4-[bis[4-(diethylamino)phenyl]methylene]-2,5-cyclohexadien-1-ylidene]-N-ethylethanaminium (9CI);Ethanaminium, N-[4-[bis[4-(diethylamino)phenyl]methylene]-2,5-cyclohexadien-1-ylidene]-N-ethyl-, salt with 6-hydroxy-2-naphthalenesulfonic acid (1:1) (9CI);