Table 2. Selected geometric parameters (, ) for (II) .
| N1N2 | 1.3266(15) | N2C20 | 1.4527(16) |
| N1C9 | 1.3477(16) | N3C10 | 1.3450(16) |
| N2N3 | 1.3279(15) | ||
| N1N2N3 | 115.92(10) | C4C3C2 | 132(2) |
| C2C1C9 | 129.94(17) | C7C8S1 | 129(2) |
| C8S1C1 | 91.33(8) | C1C9C10 | 127.3(11) |
| C4C3C2 | 129.79(17) | C10C9C1 | 132.41(13) |
| C9C1S1 | 128.0(18) | C9C10C11 | 132.90(12) |
| C8S1C1 | 95.8(12) |