The compound5-((3-(2,4-trifluoromethyphenyl)isoxazol-5-yl)methyl)-2-(2-fluoro--phenyl)-5H-imidazo[4,5-c]pyridine, or a salt thereof. Also provided are compositionscomprising this compound and pharmaceutically acceptable carriers, as well astheuse of such compositions in the treatment or prophylaxis of viral infections,such asa flaviviral or picornaviral infection, including hepatitis C viral infection.