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 (2S)-1-(3-ethylphenyl)-4-ethylsulfonyl-N-[(4-fluorophenyl)methyl]-2-methyl-6-oxopiperazine-2-carboxamide .
user
C23H28FN3O4S
assistant