You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Translate the chemical IUPAC name 3-[(2,5-dichlorophenyl)sulfanylmethyl]-N-[(2S)-1-(ethylamino)-1-oxopropan-2-yl]benzamide into its molecular formula.
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C19H20Cl2N2O2S
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