FIELD: chemistry.
SUBSTANCE: claimed invention relates to crystalline forms A, B, E and F of (3R,4S)-7-hydroxymethyl-2,2,9-trimethyl-4-(phenethylamino)-3,4-dihydro-2H-pyrano[2,3-g]quinolin-3-ol of formula I: 
representing an excellent medication of an anti-arrhythmic action, and methods of their obtaining, which include crystallisation of (3R,4S)-7-hydroxymethyl-2,2,9-trimethyl-4-(phenethylamino)-3,4-dihydro-2H-pyrano[2,3-g]quinolin-3-ol from a acetic acid ester, aliphatic hydrocarbon, or ethanol, applied as a solvent.
EFFECT: forms possess good stability and high solubility.
8 cl, 9 dwg, 3 tbl, 6 ex
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