[4-[[4-(diethylamino)phenyl][4-[(4-ethoxyphenyl)amino]-1-naphthyl]methylene]-2,5-cyclohexadien-1-ylidene]diethylammonium chloride

(a) 4-(Dichloro(4-(diethylamino)phenyl)methyl)-N,N-diethylbenzenamine and N-(4-ethoxyphenyl)-1-naphthylamine?condensation; (b) Bis(4-(diethylamino)phenyl)methanol and N-(4-ethoxyphenyl)-1-naphthylamine?condensation, the product into N-and the nitro derivatives, and then oxidation, and remove the nitro.

green light blue.