You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named 3-(4-oxocinnolin-1-yl)-N-[[(15S)-15-tetracyclo[6.6.2.02,7.09,14]hexadeca-2,4,6,9,11,13-hexaenyl]methyl]propanamide by IUPAC nomenclature, provide its molecular formula.
user
C28H25N3O2
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