Formulations thiophene compounds

a pharmaceutical composition comprising described: a) a M polymorph or tromethamine salt of compound (1) represented by the structural formula (1) and b) a carrier filler. A method for preparing a pharmaceutical composition comprising: providing a mixture of the compound of formula (1) and a filling carrier to form the composition of the compound of formula (1). A method of treating an HCV infection in a subject, said method comprising administering to the subject a therapeutically effective amount of the pharmaceutical composition.