. "Catalysis of the reaction: (+)-(3S,4R)-cis-3,4-dihydroxy-3,4-dihydrofluorene = 3,4-dihydroxyfluorene + 2 H+ + 2 e-." . . "3,4-dihydroxy-3,4-dihydrofluorene dehydrogenase activity" . . .