You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named tert-butyl 4-[(1S,2R)-2-amino-1-hydroxy-3-[[(1S,2S)-2-hydroxy-1,2-diphenylethyl]-methylamino]-3-oxopropyl]piperidine-1-carboxylate by IUPAC nomenclature, provide its molecular formula.
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C28H39N3O5
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