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Figure 4
ππ stacking inter­actions viewed along c. Cg1, Cg3, Cg5 and Cg7 are the centroids of the N1/N2/C7/C8/C13, C8–C13, N4/N5/C21/C22/C27 and C22–C27 rings, respectively, with centroids shown as colored spheres and CgCg contacts drawn as green dotted lines.

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