4-HIDROXI-2-METIL-N-(2-PIRIDIL)-2H-1,2-BENZOTIAZINA-3-CARBOXAMIDA-2,1-DIOXIDO-MONOHIDRATO Y PROCEDIMIENTO PARA SU OBTENCION

摘要

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).