The present invention relates to a compound of the formula ((I): in which: n is an integer chosen from 1, 2 and 3; Y represents O; N--OR.sup.9, in which R.sup.9 represents H or a saturated hydrocarbon-based aliphatic group; CR.sup.10R.sup.11, in which R.sup.10 and R.sup.11, which may be identical or different, represent H or a saturated hydrocarbon-based aliphatic group; R.sup.1 and R.sup.2, which may be identical or different, represent H or a saturated aliphatic hydrocarbon-based chain; or alternatively R.sup.1 and R.sup.2 together form an optionally substituted saturated aliphatic hydrocarbon-based chain; the radicals R.sup.3 and R.sup.4, which may be identical or different, take any of the is meanings given above for R.sup.1 and R.sup.2, or alternatively R.sup.1 and the group R.sup.4 borne by the carbon alpha to CR.sup.1R.sup.2 represent nothing and a double bond links the CR.sup.1R.sup.2 carbon to the alpha CR.sup.3R.sup.4 carbon; or alternatively one of the radicals R.sup.1 and R.sup.2 forms with one of the radicals R.sup.3 and R.sup.4 an optionally substituted saturated or unsaturated aliphatic hydrocarbon-based chain; one of the radicals R.sup.5 and R.sup.6 represents W, and the other represents Z which is chosen from a saturated or unsaturated aliphatic hydrocarbon-based radical; an optionally substituted, saturated, unsaturated and/or aromatic carbocyclic or heterocyclic radical; a radical -alk-Cy, in which alk represents an alkylene chain and Cy represents an optionally substituted saturated, unsaturated and/or aromatic heterocyclic or carbocyclic radical; W represents --XL-CO.sub.2R.sup.7; --X-L-Tet, in which X and L are as defined below and Tet represents optionally substituted tetrazole; in which L represents a saturated or unsaturated aliphatic hydrocarbon-based chain, which is optionally substituted and/or optionally interrupted by optionally substituted arylene; X represents O; NR.sup.8, in which R.sup.8 represents H; a saturated aliphatic hydrocarbon-based group; a group --CO--R' or --SO.sub.2--R', in which R' takes any of the meanings given below for R.sup.7 with the exception of H; or R.sup.8 represents an optionally substituted aromatic carbocyclic group; or X represent S(O).sub.m, in which m is chosen from 0, 1 and 2; R.sup.7 represents H; a saturated or unsaturated aliphatic hydrocarbon-based group; an optionally substituted, saturated, unsaturated and/or aromatic carbocyclic group; an optionally substituted, saturated, unsaturated and/or aromatic heterocyclic group; and the pharmaceutically acceptable derivatives, salts, solvates and stereoisomers thereof, and also mixtures thereof in all proportions, which can be used in the treatment of dyslipidaemia, atherosclerosis and diabetes.