The present invention provides (1aR,12bS)-8-cyclohexyl-11-fluoro-N-((1-methylcyclopropyl)sulfonyl)-1a-((3-methyl-3,8-diazabicyclo[3.2.1]oct-8-yl)carbonyl)-1,1a,2,12b-tetrahydrocyclopropa[d]indolo[2,1-a][2]benzazepine-5-carboxamide (formula I), including pharmaceutically acceptable salts, as well as compositions and methods of using the compound. The compound has activity against hepatitis C virus (HCV) and may be useful in treating those infected with HCV.本發明提供(1aR,12bS)-8-環己基-11-氟-N-((1-甲基環丙基)磺醯基)-1a-((3-甲基-3,8-二氮雜雙環[3.2.1]辛-8-基)羰基)-1,1a,2,12b-四氫環丙并[d]吲哚并[2,1-a][2]苯并氮呯-5-甲醯胺(式I)(包括醫藥上可接受之鹽),以及使用該化合物之組合物及方法。該化合物具有抵抗C型肝炎病毒(HCV)之活性且可用於治療彼等感染HCV者。