You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
1-[3-(3-fluorophenyl)propyl]-2-methyl-3-(2-methyl-5,6,7,8-tetrahydro-[1,2,4]triazolo[1,5-a]pyridin-8-yl)guanidine The above is the IUPAC name of a molecule. Write its molecular formula.
user
C18H25FN6
assistant