You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named [3-[4-(2-cyclopentyl-1H-imidazol-5-yl)phenyl]-2,2a,7,7a-tetrahydro-1H-cyclobuta[a]inden-6-yl] trifluoromethanesulfonate by IUPAC nomenclature, provide its molecular formula.
user
C26H25F3N2O3S
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