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 3-[(4-fluorophenyl)methylsulfanyl]-4-methyl-5-(5-methyl-4-phenylthiophen-3-yl)-1,2,4-triazole .
user
C21H18FN3S2
assistant