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)-N'-[2-(2-ethylbenzimidazol-1-yl)acetyl]-2-methyl-3-methylsulfanylpropanehydrazide is given. What is its corresponding molecular formula?
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C16H22N4O2S
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