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Figure 2 Part of the crystal structure of (I) showing the formation of centrosymmetric (8) dimmers rings and C(4) chains which are running parallel to the [100] direction. [Symmetry codes: (i) 1 + x,y + z; (ii)1 − x,1 − y,1 − z; (iii) −x,1 − y,1 − z]. |