You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named [3-[(3E)-3-[(5-tert-butyl-2-methylphenyl)-hydroxymethylidene]-1-(4-methoxyphenyl)-4,5-dioxopyrrolidin-2-yl]phenyl] acetate by IUPAC nomenclature, provide its molecular formula.
user
C31H31NO6
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