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)-4-[(2R)-2-[2-cyano-5-(trifluoromethyl)phenyl]sulfanyl-2-pyridin-3-ylethyl]-2,2-dimethyl-1,3-oxazolidine-3-carboxylic acid .
user
C21H20F3N3O3S
assistant