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 4-[(5-ethyl-1,2,4-oxadiazol-3-yl)methyl]-6-methyl-3-oxo-N-(pyridin-3-ylmethyl)-1,4-benzoxazine-7-sulfonamide .
user
C20H21N5O5S
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