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 [2-(benzylamino)-3-phenyl-4H-[1,2,4]triazino[3,2-a]isoquinolin-5-ium-1-yl] ethanesulfonate .
user
C26H25N4O3S+
assistant