STABLE CRYSTAL OF 4-OXOQUINOLINE COMPOUND
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United States of America Patent
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Feb 1, 2018
app pub date -
Mar 1, 2017
filing date -
May 20, 2004
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Abstract
Provision of a stabilized crystal of 6-(3-chloro-2-fluorobenzyl)-1-[(S)-1-hydroxymethyl-2-methylpropyl]-7-methoxy-4-oxo-1,4-dihydroquinoline-3-carboxylic acid (compound A). A crystal of compound A, which shows a particular X-ray powder diffraction pattern of a characteristic diffraction peaks at diffraction angles 2θ(°) as measured by X-ray powder diffractmetry.
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