Flurecol , its CAS NO. is 467-69-6, the synonyms are 3-10-00-01251 (Beilstein Handbook Reference) ; 9-Hydooxyfluorene-9-carboxylic acid ; BRN 1314711 ; EINECS 207-397-1 ; Glycolic acid, diphenylene- ; NSC 97576 .