You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Translate the chemical IUPAC name 4-[3-(2-methoxyphenyl)prop-2-enyl]-3-[2-(oxazinan-2-yl)-2-oxoethyl]piperazin-2-one into its molecular formula.
user
C20H27N3O4
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