FIELD: pharmaceuticals.
SUBSTANCE: invention relates to a compound represented in formula (I) or a pharmaceutically acceptable salt thereof, wherein Ra and Rb are each independently either hydrogen or C1-3alkyl; Rc is either hydrogen or C1-3alkyl; and * indicates either R or S configuration. The invention also relates to the intermediates represented in formulas (I-1) and (II-1).
EFFECT: new compounds have been obtained that can be used in medicine as therapeutic agents for the treatment and prevention of pain and diseases associated with pain.
26 cl, 2 dwg, 2 tbl, 8 ex
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