You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
benzyl N-[(2S)-1-[[(2S)-1-amino-4-methyl-1-oxopentan-2-yl]amino]-3-(3-bromophenyl)-1-oxopropan-2-yl]carbamate is the IUPAC name of a molecule. Please give its molecular formula.
user
C23H28BrN3O4
assistant