Work at Hepaitech (Beijing) Biopharma Technology Co. Ltd. has led to the identification of Mas-related G-protein coupled receptor member X4 (MRGPRX4; SNSR5; SNSR6) antagonists reported to be useful for the treatment of anemia, fungal infections, HIV infections, renal disorders, liver diseases, psoriasis, pruritus and urticaria, among others.