You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
5-benzyl-3-(4-nitrophenyl)-N-(4-phenylbutyl)-4,6-dihydro-3aH-pyrrolo[3,4-d][1,2]oxazole-6a-carboxamide is the IUPAC name of a molecule. Please give its molecular formula.
user
C29H30N4O4
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