RED 500;9-(Ethyl(3-methylbutyl)amino)spiro(12H-benzo(A)xanthene-12,1'(3'H)isobenzofuran)-3'-one;Spiro(12H-benzo(A)xanthene-12,1'(3'H)-isobenzofuran)-3'-one, 9-(ethyl(3-methylbutyl)amino)-;Spiro(12H-benzo(A)xanthene-12,11(3'H)-isobenzofuran)-3'-one, 9-(et