You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
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Under IUPAC nomenclature, a molecule named (1R)-1-[2-[6-(cyclopropylamino)-2-propan-2-ylpyrimidin-4-yl]-3,4-dihydro-1H-isoquinolin-6-yl]ethanol is given. What is its corresponding molecular formula?
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C21H28N4O
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