You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Name the molecular formula for the molecule established as (2S)-2-(4-chloro-2-methylphenoxy)-1-[4-(4-nitrophenyl)piperazin-1-yl]propan-1-one using the IUPAC nomenclature.
user
C20H22ClN3O4
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