obsolete 1,2-dihydroxyfluorene 1,1-alpha-dioxygenase activity (obsolete GO:0018557)
OBSOLETE. Catalysis of the reaction: 1,2-dihydroxyfluorene + O2 = 2-hydroxy-4-(2-oxo-1,3-dihydro-2H-inden-1-ylidene) but-2-enoic acid.