Crystal structures of the sulfones of 2,3-diphenyl-2,3-dihydro-4<i>H</i>-1,3-benzothiazin-4-one and 2,3-diphenyl-2,3-dihydro-4<i>H</i>-pyrido[3,2-<i>e</i>][1,3]thiazin-4-one
Acta crystallographica. Section E, Crystallographic communications