You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Translate the chemical IUPAC name 2-[[5-ethyl-4-[1-[ethyl(methyl)amino]-1-oxopropan-2-yl]-1,2,4-triazol-3-yl]sulfanyl]acetic acid into its molecular formula.
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C12H20N4O3S
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