EB-0156 is a potent inhibitor of ER α-glucosidase (α-Glu) I and II with IC50 values of 0.0479 and <0.001 μM, respectively. EB-0156 is an N-substituted valerian derivative with broad-spectrum antiviral activity. EB-0156 has potential for broad-spectrum drug discovery against existing and emerging viruses.