You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
N-[2,2,2-trichloro-1-[(3-nitrophenyl)carbamothioylamino]ethyl]naphthalene-1-carboxamide is the IUPAC name of a molecule. Please give its molecular formula.
user
C20H15Cl3N4O3S
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