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 (2R,4S)-2-(4-fluorophenyl)-1-[(4R)-7-hydroxysulfanyl-3,4-dihydro-2H-chromen-4-yl]-4-methylsulfanylpiperidine .
user
C21H24FNO2S2
assistant