You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
5-[4-amino-5-(trifluoromethyl)pyrrolo[2,1-f][1,2,4]triazin-7-yl]-2-chloro-3-fluoro-N-[(3R,4S)-4-fluoro-1-(3,3,3-trifluoropropanoyl)pyrrolidin-3-yl]benzamide is the IUPAC name of a molecule. Please give its molecular formula.
user
C21H15ClF8N6O2
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