Gusacitinib (ASN-002) hydrochloride is an orally active dual SYK/JAK kinase inhibitor with IC 50 values of 5, 46, 4, 11 and 8 nM for SYK , JAK1 , JAK2 , JAK3 and TYK2 , respectively. Gusacitinib hydrochloride rapidly and significantly suppressed key inflammatory pathways implicated in atopic dermatitis pathogenesis. Gusacitinib hydrochloride can be used in the research of chronic hand eczema and cancers such as basal cell carcinoma.