You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
2-[(3S)-3-(2-oxo-9-quinolin-3-ylpyrazino[2,3-c]quinolin-1-yl)piperidin-1-yl]acetonitrile is the IUPAC name of a molecule. Please give its molecular formula.
user
C27H22N6O
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