You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
2-[[5-[(2-chlorophenoxy)methyl]-4-cyclopropyl-1,2,4-triazol-3-yl]sulfanyl]-N-(2,6-dichlorophenyl)acetamide is the IUPAC name of a molecule. Please give its molecular formula.
user
C20H17Cl3N4O2S
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