Adriforanttartratehydrate, also known as ZPL-3893787 tartratehydrate, PF-3893787 tartratehydrate and ZPL-389 tartratehydrate, is a novel histamine H4 receptor antagonist. Adriforanttartratehydrate shows an excellent in vitro profile that warrants their further investigation in relevant models of human disease. Histamine H4 receptor (H4R) has become a promising target for immuno-inflammatory diseases, such as allergic rhinitis, asthma or dermal allergies.