You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Under IUPAC nomenclature, a molecule named ethyl 2-(1-oxidopyridin-1-ium-3-yl)acetate;2-(1-oxidopyridin-1-ium-3-yl)acetic acid is given. What is its corresponding molecular formula?
user
C16H18N2O6
assistant