Table 1. Selected geometric parameters (Å, °).
| S1—C2 | 1.7322 (19) | N4—C5 | 1.309 (3) |
| S1—C5 | 1.7525 (18) | C5—N1 | 1.358 (2) |
| C2—N3 | 1.298 (2) | C11—S2 | 1.811 (2) |
| C2—S2 | 1.7473 (17) | N1—C21 | 1.411 (2) |
| N3—N4 | 1.397 (2) | ||
| C2—S1—C5 | 86.59 (9) | C5—N4—N3 | 111.44 (15) |
| N3—C2—S1 | 114.31 (13) | N4—C5—N1 | 128.67 (17) |
| N3—C2—S2 | 119.74 (14) | N4—C5—S1 | 114.15 (14) |
| S1—C2—S2 | 125.88 (10) | N1—C5—S1 | 117.17 (15) |
| C2—N3—N4 | 113.29 (16) | C5—N1—C21 | 128.45 (18) |
| S2—C11—O1—C15 | 177.11 (10) | O1—C11—S2—C2 | −55.86 (12) |
| N3—C2—S2—C11 | −164.51 (14) | C12—C11—S2—C2 | −174.12 (11) |
| S1—C2—S2—C11 | 18.65 (13) |