2321-07-5 6417-85-2 71701-21-8 80552-60-9 Dipotassium 2-(6-oxido-3-oxoxanthen-9-yl)benzoate EINECS 229-143-9 Spiro(isobenzofuran-1(3H),9'-(9H)xanthen)-3-one, 3',6'-dihydroxy-, dipotassium salt