You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(4S)-1-(1H-pyrazol-4-yl)-4-(3-thiophen-2-yl-1,2,4-oxadiazol-5-yl)pyrrolidin-2-one The above is the IUPAC name of a molecule. Write its molecular formula.
user
C13H11N5O2S
assistant