A compound of formula (I) useful for the treatment or prevention of hepatitis C viral infection, (Formula (I)) wherein: X1 and X2 are each independently CRB or N RB is H, (C1-6)alkyl, (C1-6)haloalkyl, halo. -O-(C1-6)alkyl, NH2, NH(C1-6)alkyl or N((C1-6)alkyl)2 R1 and R2 are each independently (C1-6)alkyl optionally mono- or di-substituted with -O-(C1-6)alkyl, NH2, NH(C1-6)alkyl or N((C1-6)alkyl)2 or R1 and R2, together with the carbon to which they are attached, are linked to form a (C3-7)cycloalkyl group or a 3- to 7-membered heterocyclyl, said cycloalkyl and heterocyclyl being optionally mono- or di-substituted with -(C1-6)alkyl RA is -C(=O)N(R3)(R4), -C(=O)O(R4), heterocyclyl or heteroaryl, wherein each said heterocyclyl and heteroaryl is optionally substituted 1 to 3 times with R41 R5 and R6 are each independently H or (C1-6)alkyl optionally mono- or di-substituted with -O-(C1-6)alkyl, NH2, NH(C1-6)alkyl or N((C1-6)alkyl)2 or R5 and R6, together with the carbon to which they are attached, are linked to form a (C3-7)cycloalkyl group or a 3- to 7-membered heterocyclyl, said cycloalkyl and heterocyclyl being optionally mono- or di-substituted with -(C1-6)alkyl and n is 0, 1 or 2.Linvention concerne un composé représenté par la formule (I) utilisé pour le traitement ou la prévention dune infection à virus de lhépatite C, (formule (I)) dans laquelle: X1 et X2 sont chacun indépendamment lun de lautre CRB ou N RB est H, (C1-6)alkyle, (C1-6)haloalkyle, halo. -O-(C1-6)alkyle, NH2, NH(C1-6)alkyle ou N((C1-6)alkyle)2 R1 et R2 sont chacun indépendamment les uns des autres (C1-6)alkyle éventuellement mono- ou di-substituté par -O-(C1-6)alkyle, NH2, NH(C1-6)alkyle ou N((C1-6)alkyle)2 ou R1 et R2, conjointement avec le carbone auquel ils sont rattachés, sont liés de manière à former un groupe (C3-7)cycloalkyle ou une hétérocyclyle comprenant de 3 à 7 ramifications, lesquels cycloalkyle et hétérocyclyle étant éventuellement mono- ou di-substitutés par -(C1-6)alkyle RA est -C(=O
