IFN alpha-IFNAR-IN-1 hydrochloride is a nonpeptidic, low-molecular-weight inhibitor that inhibits the interaction between IFN-α and IFNAR. IFN alpha-IFNAR-IN-1 hydrochloride inhibits modified Vaccinia virus ankara (MVA)-induced IFN-α responses in murine bone-marrow-derived, Flt3- L-differentiated pDC cultures (BM-pDCs) with IC50 value of 2-8 μM.