Table 1. Selected bond lengths (Å).
| C20—O3 | 1.241 (4) | C16—C17 | 1.459 (4) |
| N2—C20 | 1.333 (5) | C15—C16 | 1.329 (5) |
| N1—N2 | 1.406 (4) | C12—C15 | 1.470 (4) |
| N1—C17 | 1.292 (4) | C7—O1 | 1.219 (4) |
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