AR-A 2 is a selective 5-HT1B receptor antagonist, with a high affinity to guinea pig cortex 5HT1B 1D and recombinant guinea pig 5-HT1B receptors (Ki: 0.24 and 0.47 nM) and with 10-fold lower affinity to guinea pig 5-HT1D receptor (Ki: 5 nM).
HMR 1556 is a chromanol derivative and is an IKs blocker (IC50s of 10.5 nM and 34 nM in canine and guinea pig left ventricular myocytes, respectively).
Devazepide is a competitive and orally active nonpeptide antagonist of cholecystokinin (CCK) receptor (IC50s: 81 pM, 45 pM, and 245 nM for rat pancreatic, bovine gallbladder and guinea pig brain CCK receptors, respectively).