You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
[2-oxo-2-(thiophen-2-ylmethylamino)ethyl] 3-(3-phenyl-1,2,4-oxadiazol-5-yl)propanoate The above is the IUPAC name of a molecule. Write its molecular formula.
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C18H17N3O4S
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