The crystal structure of the title salt was determined by X-ray diffraction. The compound crystallizes in a monoclinic space group, C2, with cell parameters a = 43.023(3)Å, b = 5.8504(5)Å, c = 16.6159(13)Å, β = 93.776(2)°, and Z = 4; the final residual factor, 0.0678, is for 7078 reflections.
