You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
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Under IUPAC nomenclature, a molecule named (4S)-5-amino-5-oxo-4-[[(2S)-1-[(2R)-pyrrolidin-1-ium-2-carbonyl]piperidine-2-carbonyl]amino]pentanoic acid;2,2,2-trifluoroacetate is given. What is its corresponding molecular formula?
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C18H27F3N4O7
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