Table 2. IC50 values for the inhibition of TSPO WT and TSPO A147T over-expressing 293T cell viability.
| Compound | TSPO WT IC50 (μM) | TSPO A147T IC50 (μM) | TSPO A147T IC50/TSPO WT IC50 |
| PK 11195 | 67.4 ± 10.5 | 69.15 ± 2.6 | 1.0 |
| DPA-713 | >100 | >100 | n/a |
| XBD-173 | 29.5 ± 3.5 | 26.2 ± 3.3 | 0.9 |
| 3b | >100 | >100 | n/a |
| 5a | 23.7 ± 1.0 | 22.9 ± 1.1 | 1.0 |