You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Provide the molecular formula for the IUPAC named substance 3-(3-hydroxy-1H-indol-2-yl)-2-(4-methylpiperazin-4-ium-1-carboximidoyl)prop-2-enenitrile .
user
C17H20N5O+
assistant