You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(1,1-dioxothian-4-yl)-(3-methyl-2,3-dihydro-1,4-benzothiazin-4-yl)methanone is the IUPAC name of a molecule. Please give its molecular formula.
user
C15H19NO3S2
assistant