Table 3. Structure and Activities of Analogs 18a.

| Compound | Structure | hM5 EC50 (nM) (pEC50±SEM) | hM5 % ACh Max |
|---|---|---|---|
| 18a |
|
500 (6.42±0.26) | 83±5 |
| 18b |
|
5,413 (5.27±0.05) | 64±4 |
| 18c |
|
2,612 (5.60±0.08) | 74±4 |
| 18d |
|
2,515 (5.61±0.07) | 68±2 |
| 18e |
|
631 (6.23±0.08) | 77±5 |
| 18f |
|
314 (6.53±0.08) | 70±6 |
| 18g |
|
41 (7.46±0.15) | 74±6 |
| 18h |
|
58 (7.35±0.13) | 72±7 |
| 18i |
|
76 (7.20±0.12) | 79±6 |
| 18j |
|
161 (6.86±0.11) | 76±6 |
| 18k |
|
298 (6.55±0.09) | 69±4 |
hM5 pEC50, and ACh Max data reported as averages ± SEM from our functional calcium assay; n = 3 determinations.