6'-(Diethylamino)-3'-hydroxy-3-oxospiro(isobenzofuran-1(3H),9'-(9H)xanthene)-2'-carboxylic acid 6359-29-1 64111-77-9 EINECS 228-797-2 Spiro(isobenzofuran-1(3H),9'-(9H)xanthene)-2'-carboxylic acid, 6'-(diethylamino)-3'-hydroxy-3-oxo-