A compound of formula (I) wherein T represents O, S or NR and wherein R represents a H, a C.sub.1-6alkyl group or a phenyl C.sub.1-6alkyl group and pharmaceutically acceptable salts thereof, processes for preparing such compounds, their the utility in treating clinical conditions including lipid disorders (dyslipidemias) whether or not associated with insulin resistance, methods for their therapeutic use and and pharmaceutical compositions containing them ##STR00001##