You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
5-oxo-N-[3-[2-[2-[3-[(5-oxothiolane-3-carbonyl)amino]propoxy]ethoxy]ethoxy]propyl]thiolane-3-carboxamide is the IUPAC name of a molecule. Please give its molecular formula.
user
C20H32N2O7S2
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