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).
Iloperidone metabolite P95 is a metabolite of the atypical antipsychotic iloperidone . It binds to the serotonin (5-HT) receptor subtype 5-HT2A and α1-, α2B-, and α2C-adrenergic receptors with mean Ki values of 7.08, 21.38, 83.18, and 47.86 nM, respectively, but does not cross the blood-brain barrier.