Crystal of 6-[4-(4-pyridylamino)phenyl]-4,5-dihydro-3(2h)-pyridazinone hydrochloride trihydrate
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United States of America Patent
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Issued Date -
Nov 11, 2004
app pub date -
Jun 22, 2004
filing date -
Apr 27, 2001
priority date (Note) -
Abandoned
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Abstract
The present invention provides crystals of 6-[4-(4-pyridylamino)phenyl]-4,-5-dihydro-3(2H)-pyridazinone hydrochloride trihydrate useful as a medicament for therapeutic treatment of cardiac failure, and the like; and a pharmaceutical composition comprising said crystals as an active ingredient. The crystal of the present invention has characteristic absorption peaks (2 .theta. degrees) at 12.9 (.+-.0.2.degree.) and 19.0 (.+-.0.2.degree.), for example, in powder X-ray diffractometry.
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