μ-1,2-Bis(diphenylphosphino)ethane-κ<sup>2</sup><i>P</i>:<i>P</i>′-bis{[1,2-bis(diphenylphosphino)ethane-κ<sup>2</sup><i>P</i>,<i>P</i>′]bromidocopper(I)} acetone disolvate
Acta crystallographica. Section E