FIELD: chemistry.
SUBSTANCE: invention describes an improved method forobtaining composition of the formula (II) or its salt, 
, by affecting compound of the formula (III) 
with activated derivative of propionic acid taken in the quantity of 1.3 mol per 1 mol of the compound III, and further removal of propionyl group linked to S atom from the compound of the formula IIA by effect of organic primary or secondary amine base capable of forming a water-soluble propanamide of diethanolamine or N-methylpiperazine preferentially.
EFFECT: obtaining product free from N,N-diethylpropanamide.
11 cl, 12 ex
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