Table 3. Testing SAR of S1′ Substitution in Pentanoic Acid Seriesa.

| Compound | R1 | R2 | hNEPIC50 (nM) |
|---|---|---|---|
| LBQ657 | (R)-CH3 | H | 6 |
| 29 | (S)-CH3 | Cl | 2 |
| 30 | (R)-CH3 | Cl | 0.3 |
| 31 | rac-CH3 | Cl | 0.8 |
IC50 values are the mean of at least two independent assays.

| Compound | R1 | R2 | hNEPIC50 (nM) |
|---|---|---|---|
| LBQ657 | (R)-CH3 | H | 6 |
| 29 | (S)-CH3 | Cl | 2 |
| 30 | (R)-CH3 | Cl | 0.3 |
| 31 | rac-CH3 | Cl | 0.8 |
IC50 values are the mean of at least two independent assays.