You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named (4R)-4-(3,4-dimethoxyphenyl)-N-(2-phenylethyl)-4,6-dihydropyrrolo[1,2-a][1,4]benzodiazepine-5-carboxamide by IUPAC nomenclature, provide its molecular formula.
user
C29H29N3O3
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