You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
4-[3-methyl-2,5-dioxo-4-[6-[4-(2-phenoxyacetyl)piperazin-1-yl]hexyl]pyrrol-1-yl]-2-(trifluoromethyl)benzonitrile is the IUPAC name of a molecule. Please give its molecular formula.
user
C31H33F3N4O4
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