The present invention relates to piperidine oligomers, methods for the preparation of piperidine oligomers and compound libraries thereof, and the use of piperidine oligomers as drug substances. The present invention also relates to the use of combinatorial libraries of piperidine oligomers for screening purposes. The oligomers have one of the general formulas (I) or (II). Each of the monomers (piperidine carboxylic acids) are linked via amide bonds. The piperidine monomers may carry substituents, particularly hydroxy, hydroxymethyl, and carboxy substituents. The oligomers may be prepared in libraries (arrays) of compounds especially suitable for screening purposes.