(S)-1-[(S)-2-(2'-Diphenyphosphinophenyl)ferrocenyl]ethyldiphenylphosphine,Walphos(S,S);(s,s)-1-[1-(diphenylphosphino)ethyl]-2-[2-(diphenylphosphino)phenyl]ferrocene (acc to cas);(S)-1-{(SP)-2-[2-(Diphenylphosphino)phenyl]ferrocenyl}ethyldiphenylphosphine;(1S)-1-[(1S)-1-(Diphenylphosphino)ethyl]-2-[2-(diphenylphosphino)phenyl]ferrocene