Compounds constituting C20-modified salinomycin derivatives, a method for obtaining the same, a composition containing the same, a use of said compounds and a method for obtaining an intermediate product

A compound of a general formula

• or a salt thereof;
• wherein:
• X is selected from R, O—R or NH—R;
• wherein R is selected from:
• a straight-chain or a branched-chain alkyl group comprising 1 to 10 carbons,
• a straight-chain or a branched-chain alkyl group comprising 1 to 10 carbons which is substituted at any carbon by 1 to 5 halogens, which may be present at the same carbon or at different carbons,
• a straight-chain alkyl group comprising 2 to 10 carbons which comprises ether moiety at any position of the straight-chain alkyl group,
• a straight-chain alkyl group comprising 3 to 10 carbons and comprising one or more double or triple bonds at any position of the straight-chain alkyl group,
• a monocyclic, dicyclic or tricyclic alkyl group comprising 5 to 10 carbons,
• an aryl group,
• an aryl group substituted by 1 to 3 substituents independently selected from alkyl, alkoxy, hydroxy, nitro, nitrile, and halogens,
• an heteroaryl group, wherein one or more carbons are substituted by 1 or more heteroatoms selected from oxygen, nitrogen, and sulphur, or
• an alkyl-aryl group, wherein the aryl group is optionally substituted by 1 to 3 substituents independently selected from alkyl, alkoxy, hydroxy, nitro, nitrile, and halogens and the alkyl group comprises 1 to 5 carbons.