You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Can you give the molecular formula of the molecule 3-[3,4-dimethoxy-5-[(2-methyl-3-oxo-4H-1,4-benzoxazin-6-yl)sulfamoyl]phenyl]prop-2-enoic acid ?
user
C20H20N2O8S
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