Table 1. Selected bond lengths (Å).
| O2—C9 | 1.292 (4) | C8—C13 | 1.410 (5) |
| O3—C10 | 1.358 (4) | C9—C10 | 1.426 (4) |
| N1—C6 | 1.413 (4) | C10—C11 | 1.359 (5) |
| N1—C7 | 1.302 (4) | C11—C12 | 1.402 (5) |
| C7—C8 | 1.408 (4) | C12—C13 | 1.349 (4) |
| C8—C9 | 1.429 (4) |
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