FIELD: medicine, pharmaceutics.
SUBSTANCE: there are described new N-cyclic sulphonamido-compounds and their pharmaceutically acceptable salts of formula : 
of formula 1a 
of formula 1b 
of formula 1c where the ring A means phenyl, thienyl which can be substituted by halogen, or pyridinyl; a value of the ring B is presented in the patent claim, and also a pharmaceutical composition containing them, and a method of treating Alzheimer's disease.
EFFECT: compounds are gamma-secretase inhibitors and can be used for treating Alzheimer's disease.
16 cl, 98 ex
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