You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Provide the molecular formula for the IUPAC named substance 1-[(3S)-1-tert-butyl-5-oxopyrrolidin-3-yl]-3-[(3-methylthiophen-2-yl)methyl]urea .
user
C15H23N3O2S
assistant