H4R antagonist 1 is a highly selective histamine H4 receptor (H4R) antagonist (IC50: 27 nM). H4R antagonist 1 does not show any noticeable binding affinity to other subtypes of histamine receptors, H1R, H2R, and H3R.
Imetit dihydrobromide is a high affinity and effective agonist of histamine H3 and H4 receptors (Ki: 0.3 and 2.7 nM). Imetit mimics the histamine effect in triggering a shape change in eosinophils (EC50: 25 nM).
A-940894 is a histamine H4 receptor antagonist with anti-inflammatory properties. A-940894 potently binds to both human and rat histamine H4 receptors and exhibits considerably lower affinity for the human histamine H1, H2, or H3 receptors. A-940894 has g