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COMMUNICATIONS m,.(.. z=4. u = i~. i 3~o (~2~. /1=19.028(2). ~= 1 9 . 4 4 : ( 3 ) h . [I= io4.nx3(io) . I,= 3635.2(x) .P. f i~, u , c , t = I . % g~m -~. MO,,. 1 = o 71073 A. ii = 1.222 mni-I. 5543 unique data were collected ( ( u s c m tcchnique. 4.0<20<47.5 J of which 2416 had I>2u(1) and were used for structure solution and refinement. R = 0 06x4. Further details ofthe crystal structui-e iiivcstigalions may be obtained from the Fachinforinationsrentrum Karlsruhe. D-76344 Eggenstein-Lcopoldschlll'en (FRG). on quoting the depository nuniher C'SD-57775, the iiiinics of the iiuthoi-s and. the journal citation.

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