You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
2-N-[2-[4-[2,4-difluoro-5-[(3R,4S)-4-fluoropyrrolidin-3-yl]oxyphenyl]piperazin-1-yl]ethyl]-7-(furan-2-yl)-2-N-methylpyrazolo[1,5-a][1,3,5]triazine-2,4-diamine is the IUPAC name of a molecule. Please give its molecular formula.
user
C26H30F3N9O2
assistant