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 (4S)-N-(2-morpholin-4-ylethyl)-2-oxo-3-(thiophen-2-ylmethyl)-1,3-oxazolidine-4-carboxamide .
user
C15H21N3O4S
assistant