| STB-3/MeOH | λa at main peak (nm) 351 | ε × 10−4 (l·mole−1·cm−1) 5.89 | ||
| a | b | a | b | |
| Method I | 345 | 343 | 5.16 | 4.66 |
| Method II | 344 | 342 | 5.49 | 5.38 |
| Method III | 348 | 346 | 5.96 | 5.92 |