You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Translate the chemical IUPAC name 1-[7-amino-3-(2-methylpropanoyl)-3,4-dihydro-1H-isoquinolin-2-yl]-2,2-dimethylpropan-1-one into its molecular formula.
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C18H26N2O2
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