You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
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For the molecule named (2S)-1-[(3R,4S)-1-[3-cyano-1-[(1R)-1-(2,4-dichlorophenyl)ethyl]pyrazolo[3,4-b]pyrazin-6-yl]-3-[(2,2,2-trifluoroacetyl)oxymethyl]piperidin-4-yl]pyrrolidine-2-carboxylic acid by IUPAC nomenclature, provide its molecular formula.
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C27H26Cl2F3N7O4
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