You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(3S)-N-[2-(2-methylimidazol-1-yl)ethyl]-1,1-dioxo-3,4-dihydro-2H-1lambda6,2-benzothiazine-3-carboxamide is the IUPAC name of a molecule. Please give its molecular formula.
user
C15H18N4O3S
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