You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Convert the IUPAC name of a molecule N-[5-[[[C-(3,4-dihydro-1H-isoquinolin-2-yl)-N-methylcarbonimidoyl]amino]methyl]-2-methoxyphenyl]acetamide;hydroiodide into molecular formula.
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C21H27IN4O2
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