You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Please write the molecular formula of the molecule 1-[(5-fluoro-3-methyl-1-benzofuran-2-yl)methyl]-2-methyl-3-[1-(2-methylpropanoyl)piperidin-4-yl]guanidine .
user
C21H29FN4O2
assistant