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 2-(2,4-dioxo-3-phenyl-4a,5a,6,7,8,9,9a,9b-octahydro-[1]benzofuro[3,2-d]pyrimidin-1-yl)-N-(2-phenylethyl)acetamide .
user
C26H29N3O4
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