You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(8-methyl-1-oxa-4,8-diazaspiro[4.5]decan-4-yl)-naphthalen-1-ylmethanone;hydrochloride is the IUPAC name of a molecule. Please give its molecular formula.
user
C19H23ClN2O2
assistant