You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(1R,5S)-3-[3-(3-chlorophenyl)propanoyl]-6-(2-methoxyethyl)-3,6-diazabicyclo[3.2.2]nonan-7-one is the IUPAC name of a molecule. Please give its molecular formula.
user
C19H25ClN2O3
assistant