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 N-[4-[(3S)-3-[(4-amino-5-chloropyrimidin-2-yl)amino]pyrrolidine-1-carbonyl]phenyl]prop-2-enamide is given. What is its corresponding molecular formula?
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C18H19ClN6O2
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