You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
cyclopropyl-[4-[[1-(cyclopropylmethyl)-5-methylimidazol-2-yl]methyl]piperidin-1-yl]methanone The above is the IUPAC name of a molecule. Write its molecular formula.
user
C18H27N3O
assistant