Table 1. Selected bond lengths (Å).
| O3—C4 | 1.3329 (14) | O2—N1 | 1.2213 (15) |
| O4—C9 | 1.2887 (15) | N1—C1 | 1.4530 (15) |
| N2—C7 | 1.3070 (15) | C7—C8 | 1.4054 (16) |
| N2—C5 | 1.4035 (15) | C8—C9 | 1.4340 (15) |
| O1—N1 | 1.2202 (15) |
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