FIELD: chemistry.
SUBSTANCE: invention relates to compounds of formulae (1), (2) or (3), or pharmaceutically acceptable salt thereof. Invention also relates to a pharmaceutical composition containing as an active ingredient a compound of formulae (1), (2) or (3), having inhibitory action on O-GlcNAcase, or a pharmaceutically acceptable salt thereof and pharmaceutically acceptable carrier. Compounds or pharmaceutically acceptable salt thereof are intended for treating Alzheimer's disease, Parkinson's disease or progressive supranuclear palsy (PSP) in a human patient in need thereof.
EFFECT: technical result is compounds which are selective inhibitors of glycosidase.
45 cl, 6 tbl, 33 ex
(1), 
(2),
(3).
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