You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
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Convert the IUPAC name of a molecule tert-butyl (2S,4S)-2-[5-chloro-3-(3-fluorophenyl)-4-oxopyrrolo[2,1-f][1,2,4]triazin-2-yl]-4-cyanopyrrolidine-1-carboxylate into molecular formula.
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C22H21ClFN5O3
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