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-(3,4,6,7,8,8a-hexahydro-1H-pyrrolo[1,2-a]pyrazin-2-yl)-5-fluoro-3-hydroxy-1,3-dihydroindol-2-one .
user
C15H18FN3O2
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