ИСТИНА

The invention relates to the field of organic chemistry, and in particular to new compounds that are amides of beta-amino acids of stereoisomers of 3-azabicyclo[2.2.1]heptene-2-carbonitrile of formula (I) or pharmaceutically acceptable salts thereof, where R1 = H - hydrogen; C1-5 - alkyl; R2 = H - hydrogen; C1-5 - alkyl; benzyl (C6H5-CH2) substituted with one, two or three halogen atoms (F); R3 = H - hydrogen; adamantyl, in which each carbon can have a substituent selected from: hydroxy (OH-); benzyl (C6H5-CH2), in which there may be substituents: hydroxy (OH-) and one halogen (F). The invention also relates to an amide of beta-amino acids of stereoisomers of 3-(3-azabicyclo[2.2.1]heptan-2-yl)-1,2,4-oxadiazole of formula (II) and an amide of beta-amino acids of stereoisomers of 5-(3-azabicyclo[2.2.1]heptan-2-yl)-1,2,4-oxadiazole of formula (III) and a dipeptidyl peptidase-4 inhibitor based on said compounds. Technical result: creation of dipeptidyl peptidase-4 inhibitors for the treatment of type 2 diabetes.