You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Translate the chemical IUPAC name cyclobutyl-[(1S,5S,7R)-3-[2-(4-methoxyphenyl)ethyl]-4,4-dioxo-11-oxa-4lambda6-thia-3,9-diazatricyclo[5.3.1.01,5]undecan-9-yl]methanone into its molecular formula.
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C21H28N2O5S
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