You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
[(2S)-butan-2-yl] 2-amino-1-[4-(trifluoromethoxy)phenyl]pyrrolo[3,2-b]quinoxaline-3-carboxylate The above is the IUPAC name of a molecule. Write its molecular formula.
user
C22H19F3N4O3
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