You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Translate the chemical IUPAC name (11R)-5-benzyl-6,11-dioxo-N-[(2S)-4-phenylbutan-2-yl]benzo[b][1,4]benzothiazepine-3-carboxamide into its molecular formula.
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C31H28N2O3S
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