You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(2S)-2-[(3R,5R)-3,5-dimethylpiperidin-1-ium-1-yl]-N-(4-methoxy-2-nitrophenyl)propanamide The above is the IUPAC name of a molecule. Write its molecular formula.
user
C17H26N3O4+
assistant