SB 271046 (Hydrochloride)

SB 271046 Hydrochloride (SB 271046A) is a potent, selective, orally active and BBB-permeable 5-HT6 receptor antagonist with pK_i of 9.02, 8.55, and 8.81 for rat, pig and human, respectively. SB 271046 Hydrochloride is over 200 fold selective for the 5-HT6 receptor vs 55 other receptors, binding sites and ion channels. Anticonvulsant activity (EC₅₀=0.16 μM)^[1]. In Vitro:SB 271046 Hydrochloride (SB 271046A) shows pK_i values of 6.55, 6.35, 6.27, 6.05, 5.95, 5.76, 5.73, 5.62, 5.55, 5.41, 5.39, 5.27 and < 4.99 at 5-HT1D, 5-HT1A, D3, 5-HT1B, 5-HT1F, α1B, 5-HT2C, 5-HT2A, D2, 5-HT2B, 5-HT7, 5-HT4 and 5-HT1E respectively. SB-271046 Hydrochloride competitively antagonizes 5-HT-induced stimulation of adenylyl cyclase activity with a pA2 of 8.71^[1]. In Vivo:SB 271046 Hydrochloride (10 mg/kg; p.o.) produces an increase in seizure threshold over a wide-dose range in the rat maximal electroshock seizure threshold (MEST) test, with a minimum effective dose of 0.1 mg/kg p.o. and maximum effect at 4 h post-dose^[1].