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 8'-chloro-3'-phenylspiro[1,3-diazinane-5,2'-4,9b-dihydro-1H-cyclopenta[c]chromene]-2,4,6-trione .
user
C21H15ClN2O4
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