You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
tert-butyl 4-[2-(5-oxidofuro[3,2-c]pyridin-5-ium-2-yl)ethyl]piperidine-1-carboxylate The above is the IUPAC name of a molecule. Write its molecular formula.
user
C19H26N2O4
assistant