You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
1-(2-ethoxyphenyl)-3-[(1S,5R)-9-prop-2-enyl-9-azoniabicyclo[3.3.1]nonan-3-yl]urea The above is the IUPAC name of a molecule. Write its molecular formula.
user
C20H30N3O2+
assistant