(6,6′-Dimeth­oxy­biphenyl-2,2′-di­yl)bis(diphenyl­phosphane) P,P′-dioxide dihydrate

In the title compound, C₃₈H₃₂O₄P₂·2H₂O, the dihedral angle between the meth­oxy­phenol rings is 84.11 (7)°. O—H...O hydrogen bonds connect the water mol­ecules of crystallization with the main mol­ecule.