1-Phenyl-3,3a-dihydropyrrolo(3,2-b)(1,4)benzothiazin-2(1H)-one 2694-31-7 BRN 1004724 Pyrrolo(3,2-b)(1,4)benzothiazin-2(1H)-one, 3,3a-dihydro-1-phenyl-