You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Please write the molecular formula of the molecule N-[3-[(2S)-2-methylpiperidin-1-ium-1-yl]propyl]-1,3-dioxo-2-prop-2-enylisoindole-5-carboxamide .
user
C21H28N3O3+
assistant