You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
ethyl 2-[4-[[(5R)-5-methyl-1,1-dioxo-2-phenyl-1,2-thiazolidine-5-carbonyl]amino]phenoxy]acetate The above is the IUPAC name of a molecule. Write its molecular formula.
user
C21H24N2O6S
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