Abstract: Compound, stereoisomers, enantiomers or diastereomers thereof, physiologically acceptable salts thereof, mixtures of said compound for use in increasing mental capability, and a pharmaceutical composition. The increasing of mental capability is tested in learning experiments with Drosophila melanogaster larvae or older animals, which are raised with standard feed mash or with different concentrations of FSE-20 in the feed mash. In the learning experiment, the animals are each subjected to one of two inverse training regimens and then subjected to a test. In the training, a first scent was presented with the feed reward to the first group, while a second scent was presented alone to the first group. The second group was trained inversely. In the test of the learning experiment, it was subsequently examined whether the larvae of both groups prefer the first scent or the second scent in a selection situation; thus, their learning and memory capability was determined.