You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
1-[(4-chloro-1-methylpyrrol-2-yl)methyl]-3-ethyl-2-[3-(4-hydroxypiperidin-1-yl)propyl]-1-methylguanidine The above is the IUPAC name of a molecule. Write its molecular formula.
user
C18H32ClN5O
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