Compounds

A compound according to formula (I):

• wherein
• X and Y are either both —CH2—, or one of X and Y is —CH2— and the other of X and Y —O—;
• R1 is a methyl group or an ethyl group;
• A is either a carbon moiety or oxygen;
• one of Z1 and Z2 represents a hydroxyl group and the other of Z1 and Z2 is a hydrogen atom;
• R2 and R3 represent a CF3 group, or R2 and R3, together with the carbon that R2 and R3 are bound to, form a cyclopropyl group;
• wherein
• the dotted/solid lines () represent either a single carbon-carbon bond or a double carbon-carbon bond, with the proviso that, if two of said bonds are double bonds, these bonds are conjugated;
• and wherein
• R4 represents a methyl group, an ethyl group, a propyl group or a (CH2)nOR5 group where n is 1, 2, 3 or 4, and
• R5 represents a hydrogen atom, a methyl group, or an ethyl group.