You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(4S)-6'-(5-ethyl-1,2,4-oxadiazolidin-3-yl)spiro[1,3-oxazolidine-4,3'-2H-1-benzofuran]-2-one The above is the IUPAC name of a molecule. Write its molecular formula.
user
C14H17N3O4
assistant