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 (2S)-2-[(2-aminoacetyl)-(cyanomethyl)amino]-3-(4-chlorophenyl)-3-oxo-N-phenylpropanamide is given. What is its corresponding molecular formula?
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C19H17ClN4O3
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