You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
N-[[(2R,3S)-2-tert-butyloxolan-3-yl]methyl]-N'-[4-[(S)-methylsulfinyl]phenyl]oxamide The above is the IUPAC name of a molecule. Write its molecular formula.
user
C18H26N2O4S
assistant