You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named 3-N-cyclooctyl-1-(2-methoxyethyl)-4-oxo-5-N-(spiro[bicyclo[2.2.1]hept-5-ene-7,1'-cyclopropane]-2-ylmethyl)pyridine-3,5-dicarboxamide by IUPAC nomenclature, provide its molecular formula.
user
C28H39N3O4
assistant