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Figure 2
(a) View of unit cell along the crystallographic a-axis. Dashed lines represent hydrogen bonding between mol­ecules. R22(14) rings are indicated with purple and green polygons; hydrogen bonds not lying on the indicated rings form the same class of ring with mol­ecules not rendered in this diagram. (b) View approximately along the (001) axis, showing how mol­ecules form ππ stacks. Some mol­ecules have been removed for clarity.

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