Table 1. Selected geometric parameters (Å, °).
| O1—C2 | 1.2627 (18) | C1—C2 | 1.503 (2) |
| N1—C4 | 1.3352 (19) | C2—C3 | 1.401 (2) |
| N1—C6 | 1.4253 (18) | C3—C4 | 1.379 (2) |
| N1—H1N | 0.902 (18) | C4—C5 | 1.495 (2) |
| C4—N1—H1N | 115.6 (11) | C4—C3—C2 | 125.24 (14) |
| C6—N1—H1N | 116.6 (11) | N1—C4—C3 | 120.05 (14) |
| O1—C2—C3 | 123.26 (13) |