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Figure 16 Part of the crystal structure of (6), which shows the formation of a (100) sheet of anions built from alternating R22(12) and R66(28) rings. For the sake of clarity, H atoms bonded to C atoms are omitted. The atoms marked with an asterisk (*), hash (#) or dollar sign ($) are at the symmetry positions (1 - x, 1 - y, 1 - z), (x,  - y, - + z) and (x, - y,  + z), respectively.

© International Union of Crystallography 2003