Hangzhou Innogate Pharma Co. Ltd. and Innorace Biopharma Co. Ltd. have patented new Mas-related G-protein coupled receptor member X2 (MRGPRX2) antagonists designed for use in the treatment of atopic dermatitis, irritable bowel syndrome, metabolic syndrome, migraine, pain, neuropathic pain, rheumatoid arthritis and urticaria, among others.