You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Convert the IUPAC name of a molecule (2S)-2-(3-ethyl-1,2,4-oxadiazol-5-yl)-N-(2-methyl-5-sulfamoylphenyl)pyrrolidine-1-carboxamide into molecular formula.
user
C16H21N5O4S
assistant