You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Translate the chemical IUPAC name 2-[3-[4-(6-methoxy-3-nitropyridin-2-yl)piperazin-1-yl]propylsulfanyl]-1,3-benzothiazole into its molecular formula.
user
C20H23N5O3S2
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