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 5-[(4R,10bS)-8-[(3R)-3-hydroxypyrrolidin-1-yl]-4-methyl-3,4,6,10b-tetrahydro-1H-pyrazino[2,1-a]isoindol-2-yl]quinoline-8-carbonitrile .
user
C26H27N5O
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