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 3-oxo-N-[5-(4-propan-2-ylphenyl)-1,3,4-thiadiazol-2-yl]-4H-1,4-benzothiazine-6-carboxamide .
user
C20H18N4O2S2
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