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1,2,3,4,5-cyclopentanepentayl, compd. with 1-[(1R)-1-[bis(3,5-dimethylphenyl)phosphino]ethyl]-2-[bis(4-methoxy-3,5-dimethylphenyl)phosphino]-1,2,3,4,5-cyclopentanepentayl, iron salt (1:1:1)