The invention relates to compounds of formula (I):where A is selected from:and R1, R2, R3, R4, R5, R10a, R10b, M, Z, r and s are as defined in the description, useful for treating disorders mediated by acyl coA-diacylglycerol acyl transferase 1 (DGAT1), for example glucose tolerance, Type II diabetes or obesity. The invention also provides pharmaceutical compositions comprising such compounds.