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 [(1R,2R,4S,5S)-9-ethyl-9-methyl-3-oxa-9-azoniatricyclo[3.3.1.02,4]nonan-7-yl] (2S)-3-hydroxy-2-phenylpropanoate;bromide;hydrate .
user
C19H28BrNO5
assistant