You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
4-N-[(7S,8aS)-3,3-dimethyl-2,5,6,7,8,8a-hexahydro-1H-indolizin-7-yl]-2-N-[3-(difluoromethoxy)-4-methoxyphenyl]-5-fluoropyrimidine-2,4-diamine The above is the IUPAC name of a molecule. Write its molecular formula.
user
C22H28F3N5O2
assistant