You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Can you give the molecular formula of the molecule N-(1,3-dimethyl-2-oxobenzimidazol-5-yl)-3-(5,11-dioxo-6aH-isoindolo[2,1-a]quinazolin-6-yl)propanamide ?
user
C27H23N5O4
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