You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
tert-butyl (2S)-2-[(2-bromophenyl)methyl]-4-[(2S)-1-hydroxy-4-methylpentan-2-yl]-3-oxopiperazine-1-carboxylate The above is the IUPAC name of a molecule. Write its molecular formula.
user
C22H33BrN2O4
assistant