You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
N-[(2S,3R)-2-ethyloxolan-3-yl]-N'-(1,1,3-trioxo-4H-1lambda6,4-benzothiazin-7-yl)oxamide is the IUPAC name of a molecule. Please give its molecular formula.
user
C16H19N3O6S
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