FIELD: chemistry.
SUBSTANCE: invention relates to new crystalline modifications of N-α-(2,4,6-triisopropylphenylsulphonyl)-3-hydroxyamidino-(L)-phenylalanine-4-ethoxycarbonyl piperazide and/or its salts. Such crystalline modifications have high stability particularly at low hygroscopicity compared to known amorphous forms of the compound.
EFFECT: invention relates to a method of obtaining such new crystalline modifications, to pharmaceutical compositions containing these new crystalline modifications and their use as an anti-tumour agent.
26 cl, 7 tbl, 13 ex, 20 dwg
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