FIELD: organic chemistry, chemical technology.
SUBSTANCE: invention relates to an improved method for synthesis of 1-(2S,3S)-2-benzhyryl-N-(5-tert.-butyl-2-methoxybenzyl)quinuclidin-3-amine (further named in the claim as "compound of the formula (I)" 
) and its pharmaceutically acceptable salts. Invention relates to an improved method of synthesis of citrate monohydrate salt of compound of the formula (Ia):
EFFECT: improved method of synthesis.
10 cl, 2 sch,
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