You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Please write the molecular formula of the molecule methyl 4-[[(2R)-2-methyl-3-[[(2S)-2-methyl-3-oxo-4H-1,4-benzothiazin-6-yl]sulfonyl]propanoyl]amino]benzoate .
user
C21H22N2O6S2
assistant