You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Please write the molecular formula of the molecule [2-(4-bromophenyl)-2-oxoethyl] (7S,8S)-7-[(methoxycarbonylamino)-propan-2-ylcarbamoyl]-1,4-dioxaspiro[4.4]nonane-8-carboxylate .
user
C22H27BrN2O8
assistant