1-HYDROXY-4-(2-HYDROXY-5-CARBOXY)-PHENYLAZO-N-(METHYL-OCTADECYLAMINO-5-SULFO)-2-NAPHTHAMIDE

N-[2-(N-METHYL-N-STEARYL)AMINO-5-SULFOPHENYL]-4-(5-CARBOXY-2-HYDROXYPHENYL)AZO-1-HYDROXY-2-NAPHTHAMIDE