110226-06-7 2H-1,4-Benzothiazin-3(4H)-one, 8-(3-(tert-butylamino)-2-hydroxypropoxy)-, fumarate (2:1) 8-(3-tert-Butylamino-2-hydroxy)propoxy-3,4-dihydro-3-oxo-2H(1,4)benzothiazine fumarate (2:1)