You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Translate the chemical IUPAC name 1-(3,4-dihydro-1H-isoquinolin-2-yl)-3-[5-(2-methoxyphenyl)-1,3,4-oxadiazol-2-yl]propan-1-one into its molecular formula.
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C21H21N3O3
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