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-[2-(dimethylamino)-2-(3-fluorophenyl)ethyl]-3-ethyl-2-[(1,3,5-trimethylpyrazol-4-yl)methyl]guanidine .
user
C20H31FN6
assistant