Abstract: A fluorine-containing compound of the formula ##STR1## wherein R.sub.f is a fluoroalkyl ether end group having 5 to 50 carbon atoms, R.sub.1 is an alkyl end group or an aliphatic alkenyl end group, R'''.sub.2 is an aliphatic alkylene group and R.sub.4 is an aliphatic alkylene group having no or one or more carbon atoms. This fluorine-containing compound can be utilized in magnetic recording media in the form of a lubricant composition.

Abstract: New antibiotic eicosenoic acids and a method of producing it are described. The acids have been found to have antifungal properties.

Abstract: Carboxylic acid derivatives of the formula ##STR1## R.sub.1 is alkoxy, alkylthio, alkylsulphinyl, alkulsulphonyl, alkylamino, cycloalkyl, or cycloalkoxy or optionally substituted aryl, aryloxy, arylthio, arylsulphinyl, arylsulphonyl or arylamino. R.sub.2 is optionally substituted aryl or, when B is alkylene also a hydrogen atom. A is a straight-chained or branched, saturated or unsaturated alkylene containing 3 to 10 carbon atoms which is optionally interrupted by a heteratom attached to a saturated carbon and has a chain length of at least 3 atoms. Y is S(O).sub.n group or oxygen, n being 0, 1 or 2. B is a valency bond or a straight-chained or branched, saturated or unsaturated alkylene containing 1 to 18 carbon atoms. Physiologically acceptable salts, esters and amides thereof are also included. The compounds are useful in the treatment of metabolic diseases.