You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
2-N-ethyl-4-N-[(1-ethylcyclopropyl)methyl]-6-(trifluoromethyl)pyrimidine-2,4-diamine The above is the IUPAC name of a molecule. Write its molecular formula.
user
C13H19F3N4
assistant