You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Translate the chemical IUPAC name N-[(2S)-butan-2-yl]-N-[(3R)-1,1-dioxothiolan-3-yl]-2-[5-(4-methylphenyl)tetrazol-2-yl]acetamide into its molecular formula.
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C18H25N5O3S
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