You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named methyl 3-[[3-[3-[2-(2-aminobenzimidazol-1-yl)ethyl]phenyl]-6-oxopyridazin-1-yl]methyl]benzoate by IUPAC nomenclature, provide its molecular formula.
user
C28H25N5O3
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