You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
1-methyl-1-[(5-methylfuran-2-yl)methyl]-3-(2,4,6-trimethylpyridin-3-yl)urea The above is the IUPAC name of a molecule. Write its molecular formula.
user
C16H21N3O2
assistant