You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
2,3-dihydro-1H-indol-5-yl-[3-(methoxymethyl)pyrrolidin-1-yl]methanone;hydrochloride is the IUPAC name of a molecule. Please give its molecular formula.
user
C15H21ClN2O2
assistant