1,2,3,4,5-cyclopentanepentayl, compd. with 1-[(1R)-1-[bis(1,1-dimethylethyl)phosphino]ethyl]-2-(di-1-naphthalenylphosphino)-1,2,3,4,5-cyclopentanepentayl, iron salt (1:1:1) [ 849924-44-3 ]