FIELD: chemistry.
SUBSTANCE: present invention relates to new crystalline Form A 1-[(3R)-6,8-difluoro-3,4-dihydro-2H-1-benzopiran-3-yl]-1,3-dihydro-5-[2-[(phenylmethyl)-amino]-ethyl]-2H-imidazole-2-thione, which has the effect of dopamine-β-hydroxylase inhibitor and method of its cleaning.
EFFECT: high output of the end product and its high stability.
16 cl, 18 dwg, 23 tbl
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