You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named 2-[3-methyl-4-[[(2R)-2-methyl-2,3-dihydroindol-1-yl]sulfonyl]phenyl]-1,1-dioxo-1,2-thiazolidin-3-one by IUPAC nomenclature, provide its molecular formula.
user
C19H20N2O5S2
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