A peptidomimetic agent from dextrorotatory amino acids includes vGek with Dval-gly-Dglu-Dlys as a central D-amino acid sequence, whereby gly is equal to D-glycine, which is equal to L-glycine. Pharmaceutical agents for use in the treatment of neurodegenerative diseases, in particular Alzheimer's disease, Parkinson's disease, Lewy Body dementia, Creutzfeldt-Jakob disease, as well as Huntington's Chorea disease, multi-system atrophy as well as disorders similar to these neurodegenerative diseases that contain at least one peptidomimetic agent from dextrorotatory amino acids are also included.