You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named (2S)-1-butanoyl-N-[(1R,2R)-2-[(4-methoxybenzoyl)-[(3-methylphenyl)methyl]amino]cyclohexyl]pyrrolidine-2-carboxamide by IUPAC nomenclature, provide its molecular formula.
user
C31H41N3O4
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