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 methyl 2-[2-[[(3-amino-5H-pyrrolo[2,3-b]pyrazin-2-yl)-formylamino]methyl]-3-ethyl-5-methoxybenzimidazol-1-ium-1-yl]acetate .
user
C21H24N7O4+
assistant