The present invention relates to alkaloid aminoester derivatives acting as muscarinic receptor antagonists, to methods of preparing such derivatives, to compositions comprising them and therapeutic use thereof.Predmetni pronal azak se odnosi na derivate alkaloidnih aminoestara koji deluju kao antagonisti muskarinskog receptora, na postupke za dobijanje takvih derivata, na preparate koj i ih sadrže i na terapeutsku primenu takvih derivata.