You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
5-[(1R)-1-(2-chlorophenyl)-1,3,4,9-tetrahydropyrido[3,4-b]indole-2-carbonyl]-1H-pyridin-2-one The above is the IUPAC name of a molecule. Write its molecular formula.
user
C23H18ClN3O2
assistant