You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
What is the molecular formula of the compound with this IUPAC name ethyl (5S,6R,7R)-8-bromo-3-[(2S)-1-hydroxybutan-2-yl]-4-oxo-2-[prop-2-enyl(2,4,4-trimethylpentan-2-yl)carbamoyl]-10-thia-3-azatricyclo[5.2.1.01,5]decane-6-carboxylate ?
user
C27H43BrN2O5S
assistant