Crystalline forms of the anti-HCV compound (1R,5S,8S,9S,10R,22aR )-5-tert-butyl-N-[(1R,2R)-2-(difluoromethyl)-1-{ [(1-methylcyclopropyl)sulfonyl]carbamoyl} cyclopropyl]-9-ethyl-18,18-difluoro-14-methoxy-3,6-dioxo-1,1a,3,4,5,6,9,10,18,19,20,21,22,22a-tetradecahydro-8H-7,10-methanocyclopropa[18,19][1,10,3,6] dioxadiazacyclononadecino[11,12-b]quinoxaline-8-carboxamide (Compound I) were prepared and characterized in the solid state. Also provided are processes of manufacture and methods of using the crystalline forms.
