You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
N-[6-[1-(hydroxymethyl)cyclopentyl]-4-(1H-imidazol-2-yl)-3-methylhexan-2-yl]acetamide The above is the IUPAC name of a molecule. Write its molecular formula.
user
C18H31N3O2
assistant