Synonyms: Iron,([bicyclopentadienyl]diyl)bis[cyclopentadienyl- (7CI); Iron,bicyclopentadienylenebis[cyclopentadienyl- (6CI); Bi-2,4-cyclopentadien-1-yl,bis(cyclopentadienyliron) deriv.; Biferrocene; Biferrocenyl; Ferrocene dimer;Ferrocene, ferrocenyl-; Iron, [m-(h10-[bicyclo-2,4-pentadien-1-yl]-1,1'-diyl)]bis(h5-2,4-cyclopentadienyl)di-