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Mr=838.71, monoclinic, P21/m, a=8.245(4), b=15.504(5), c=8.242(4) A,β=101.50(4)°,V=1032.5(1.5)A3, Dx=2.698 g/cm3, Z=2,λ(MoKα)=0.7107A. Final R=0.040, Rw=0.045, for 1460 observed reflections.