You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(2R)-2-[(2S,3S,4R)-1,2-dibenzyl-5-oxo-4-phenacylpyrrolidin-3-yl]-2-(methylamino)acetic acid is the IUPAC name of a molecule. Please give its molecular formula.
user
C29H30N2O4
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