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Cg3 is the centroid of the pyrazine ring N1/N4/C1/C2/C1i/C2i and Cg5 is the centroid of the C12–C17 ring.
| D—H⋯A | D—H | H⋯A | D⋯A | D—H⋯A |
|---|---|---|---|---|
| C18—H18C⋯Cg5i | 0.97 | 2.95 | 3.896 (5) | 165 |
| C17—H17⋯I1ii | 0.94 | 3.09 | 3.907 (4) | 147 |
| Cd1—I1⋯Cg iii | 2.70 (1) | 3.96 (1) | 6.5131 (12) | 155 (1) |
| Cd1—I1⋯Cg3iv | 2.70 (1) | 3.96 (1) | 6.5131 (12) | 155 (1) |
Symmetry codes: (i) 
; (ii) 
; (iii) 
; (iv) 
.
