Compounds of formula (I), or salts thereof, which inhibit acetyl CoA(acetyl coenzyme A):diacylglycerol acyltransferase (DGAT1) activity are provided, wherein: n is 1, 2 or 3 and each R is independently selected from fluoro, chloro, cyano, methyl, ethyl, methoxy, ethoxy, trifluoromethyl, trifluoromethoxy and difluoromethoxy; together with processes for their preparation, pharmaceutical compositions containing them and their use as medicaments.