You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
1-(4-chloro-2-ethylpyrazol-3-yl)-1-(1,3-dihydro-2-benzofuran-5-yl)-N-methylmethanamine is the IUPAC name of a molecule. Please give its molecular formula.
user
C15H18ClN3O
assistant