KSK67 is a selective dual antagonist of sigma-2 and histamine H3 receptors with inhibitory effects on H3 receptors, sigma-1, and sigma-2 receptors, with Ki values of 3.2, 1531, and 101 nM, respectively.

PD 144418 oxalate is a highly potent and selective sigma 1 (σ1) receptor ligand with a Ki value of 0.08 nM for σ1 and 1377 nM for σ2, exhibiting negligible affinity for other receptors, ion channels, and enzymes, and demonstrating potential antipsychotic activity.

Sigma-1 receptor antagonist 1 is an effective and selective antagonist of sigma-1 receptor.