摘要 |
<p>The process comprises suspension in basic medium of (NaOH1N) 4-hydroxy-2-methyl-M -(2-pyridyl)-2H-12-benzothiozin -3-carboxamide-22-dioxide. Subsequent acidification with 1NHCl to pH7 or slight acidity is then carried out. The pptd. yellow prod., 4-hydroxy-2-methyl -n-(2-pyridyl) monohydrate form of the dioxide is of formula (I).</p> |