1,3,4-oxadiazole derivatives and their uses to treat diabetes

DGAT-1 inhibitor compounds of formula (I) and pharmaceutically-acceptable salts thereof are described, together with pharmaceutical compositions, processes for making them and their use in treating, for example, obesity (I) wherein n is 0, 1, 2 or 3, R is independently selected from fluoro, chloro, bromo, trifluoromethyl, methoxy, difluoromethoxy and trifluoromethoxy and Z is carboxy or a mimic or bioisostere thereof, hydroxyl, hydroxymethyl, or −CONRbRc wherein Rb and Rc are independently selected from hydrogen and (1-4C)alkyl, which (1-4C)alkyl group may be optionally substituted by carboxy or a mimic or bioisostere thereof.