Table 2. Antagonist Properties of Compounds 8–11 at 5-HT3 and 5-HT6 Receptorsa,b.

Percent inhibition of response to stimulation by 5-HT (contraction of guinea pig ileum) at the concentration of 3 μM induced by tested compounds (300 nM).
Percent inhibition of control agonist response at 10–6 M; performed in duplicate in 1321N1 cells.
