You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
N-[[4-ethyl-5-[2-(3-methylanilino)-2-oxoethyl]sulfanyl-1,2,4-triazol-3-yl]methyl]-4-fluorobenzamide is the IUPAC name of a molecule. Please give its molecular formula.
user
C21H22FN5O2S
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