You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
2-(2-methoxyethoxy)-1-(6-methoxyspiro[3,4-dihydroisochromene-1,4'-piperidine]-1'-yl)ethanone is the IUPAC name of a molecule. Please give its molecular formula.
user
C19H27NO5
assistant