You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
4-(2,3,3a,4,6,6a-hexahydro-1H-pyrrolo[2,3-c]pyrrol-5-yl)-8-fluoro-[1]benzofuro[3,2-d]pyrimidin-2-amine;2,2,2-trifluoroacetic acid The above is the IUPAC name of a molecule. Write its molecular formula.
user
C18H17F4N5O3
assistant