You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Translate the chemical IUPAC name 1-(2,3-dihydro-1-benzofuran-2-ylmethyl)-2-methyl-3-[3-methyl-2-(4-methylpiperazin-1-yl)butyl]guanidine into its molecular formula.
user
C21H35N5O
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