You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Convert the IUPAC name of a molecule tert-butyl N-[(1R,2S)-2-[[(1S,2S)-2-(methylcarbamoyl)cyclobutyl]carbamoyl]cyclobutyl]carbamate into molecular formula.
user
C16H27N3O4
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