Table 3. Selected torsion angles (°) for (II) .
| N1—C1—C2—C3 | −69.1 (3) | C1—C2—C3—C4 | 74.4 (3) |
| C1—C2—C3—N3 | −49.5 (3) | C4—C3—N3—C5 | 136.6 (3) |
| O4—C2—C3—C4 | −167.3 (2) | C3—C2—O4—C6 | 158.0 (2) |
| N1—C1—C2—C3 | −69.1 (3) | C1—C2—C3—C4 | 74.4 (3) |
| C1—C2—C3—N3 | −49.5 (3) | C4—C3—N3—C5 | 136.6 (3) |
| O4—C2—C3—C4 | −167.3 (2) | C3—C2—O4—C6 | 158.0 (2) |