RED 520

6'-[ethyl(p-tolyl)amino]-2'-methylspiro[isobenzofuran-1(3H),9'-[9H]xanthene]-3-one

2'-Methyl-6'-(N-p-tolyl-N-ethylamino)spiro[isobenzofuran-1(3H),9'-[9H]xanthen]-3-one

6'-[ethyl(4-methylphenyl)amino]-2'-methyl-Spiro[isobenzofuran-1(3H),9'-(9H)xanthen]-3-one