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 N-[1-[3-(2-oxoimidazolidin-1-yl)phenyl]ethyl]-1,6,8-triazatricyclo[7.2.1.02,7]dodeca-2(7),3,5-triene-8-carboxamide .
user
C21H24N6O2
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