Table 3. Selected Interatomic Distances (Å) for the Lowest Energy Conformations of 5a.

| C1–C2 | C1–N1 | C1–C8 | C2–N2 | C2–C3 | |
|---|---|---|---|---|---|
| 5a-1 | 1.445 | 1.307 | 1.486 | 1.307 | 1.484 |
| 5a-2 | 1.445 | 1.306 | 1.486 | 1.306 | 1.484 |
| 5a-3 | 1.445 | 1.306 | 1.486 | 1.306 | 1.484 |
| 5a-4 | 1.445 | 1.307 | 1.486 | 1.307 | 1.484 |