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 ethyl (5S,6S,7S)-8-bromo-2-[(4-chlorophenyl)carbamoyl]-3-(2-hydroxyethyl)-4-oxo-10-thia-3-azatricyclo[5.2.1.01,5]decane-6-carboxylate .
user
C20H22BrClN2O5S
assistant