Table 1. Selected bond lengths (Å).
| N8—C5 | 1.429 (2) |
| N8—C9 | 1.356 (2) |
| N9—C9 | 1.326 (2) |
| N10—C9 | 1.332 (2) |
| N10—C11 | 1.339 (2) |
| N12—C11 | 1.338 (3) |
| N13—C11 | 1.325 (3) |
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