The present invention relates to a novel polymorphic crystal form of 8-hydroxy-5-[(1R)-1-hydroxy-2-[[(1R)-2-(4-methoxyphenyl)-1-methylethyl]-amino]ethyl]-2(1H)-quinolinone monohydrochloride. The invention also relates to processes for its preparation, pharmaceutical compositions thereof, and to its use as a medicament.
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