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 [3-ethyl-7-[2-(5,6,7,8-tetrahydropteridin-4-yl)ethyl]quinoxalin-2-yl]-piperazin-1-ylmethanone .
user
C23H28N8O
assistant