Crystal form of tricyclic benzopyran compound and production method thereof
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United States of America Patent
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Jan 26, 2016
Grant Date -
Mar 8, 2012
app pub date -
Apr 30, 2010
filing date -
Apr 30, 2009
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Abstract
Crystal forms of (3R,4S)-7-hydroxymethyl-2,2,9-trimethyl-4-(phenethylamino)-3,4-dihydro-2H-pyrano[2,3-g]quinolin-3-ol that are excellent as a drug, and production methods thereof. Production methods include crystallizing (3R,4S)-7-hydroxymethyl-2,2,9-trimethyl-4-(phenethylamino)-3,4-dihydro-2H-pyrano[2,3-g]quinolin-3-ol from an acetate ester solvent, an aliphatic hydrocarbon solvent, a nitrile solvent, an aromatic hydrocarbon solvent, a ketone solvent or an ether solvent, and crystal forms obtained according to the methods.
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