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 6-[[[(3S)-1-[2-(7-fluoro-2-oxoquinoxalin-1-yl)ethyl]pyrrolidin-3-yl]methylamino]methyl]-4H-pyrazino[2,3-b][1,4]thiazin-3-one .
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