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)-1-(ethylamino)-1-oxopropan-2-yl] (2R,3R)-2-[(4-chlorophenyl)sulfonylamino]-3-hydroxybutanoate is given. What is its corresponding molecular formula?
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C15H21ClN2O6S
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