FIELD: organic chemistry, medicine, pharmacy.
SUBSTANCE: invention relates to a novel compound represented by the following formula (1) 
, its pharmaceutically acceptable salts or optically active isomers wherein each symbol is given in the invention description. Proposed compound possesses antagonistic effect with respect to calcium-sensitive receptor (CASR). Also, invention relates to a therapeutically medicinal agent used in treatment of osteoporosis based on this compound, to a method for treatment of osteoporosis, calcium receptor antagonist and to agent promoting secretion of parathyroid hormone (PTH).
EFFECT: valuable medicinal properties of antagonist.
33 cl, 66 tbl, 5 ex
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