Hydrogeen-9-(2-carboxylatofenyl)-3-(2-methylanilino)-6-(2-methyl-4-sulfoanilino)xanthylium, mononatriumzout ###>Hydrogen 9-(2-carboxylatophenyl)-3-(2-methylanilino)-6-(2-methyl-4-sulphoanilino)xanthylium, monosodium salt