You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(2S)-2-(4-chloro-2-nitrophenoxy)-N-[(1R)-1,2,3,4-tetrahydronaphthalen-1-yl]propanamide is the IUPAC name of a molecule. Please give its molecular formula.
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C19H19ClN2O4
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