FIELD: medicine, pharmaceutics.
SUBSTANCE: invention relates to novel acid-additive salts of pyrrolopyrimidinone derivative, represented by formula (1) 
which is selected from gentisate, maleate, citrate, fumarate and semitartrate salts, which possess improved properties in their application, in particular higher stability.
EFFECT: invention also relates to method of obtaining acid-additive salts of pyrrolopyrimidinone derivative, represented by formula (1) and to pharmaceutical composition, containing them, for treatment and prevention of erectile dysfunction, pulmonary arterial hypertension, chronic obstructive lung disease, benign prostate gland hypertrophy and diseases of lower urinary tract.
11 cl, 30 ex, 7 tbl
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