Table 1. Selected geometric parameters (Å, °).
| O1—C1 | 1.222 (3) | O3—C9 | 1.186 (4) |
| O4—C18 | 1.224 (3) | O6—C26 | 1.188 (4) |
| N1—C1 | 1.348 (3) | N2—C18 | 1.344 (4) |
| O1—C1—N1 | 123.5 (3) | C1—N1—C11 | 123.4 (2) |
| O4—C18—N2 | 123.6 (3) | C18—N2—C28 | 124.2 (2) |
| C9—O2—C6—C7 | −100.0 (3) | C26—O5—C23—C24 | −83.7 (3) |
| N1—C1—C2—C7 | 129.1 (3) | C24—C19—C18—N2 | −113.6 (3) |
| C2—C1—N1—C11 | −172.4 (2) | C28—N2—C18—C19 | 166.2 (2) |
| C1—N1—C11—C16 | −66.4 (4) | C18—N2—C28—C33 | 66.0 (4) |