You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
4-fluoro-1-N-(2-fluorophenyl)-2-N-methyl-2-N-(2-morpholin-2-ylethyl)benzene-1,2-diamine;methoxymethane The above is the IUPAC name of a molecule. Write its molecular formula.
user
C21H29F2N3O2
assistant