You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named N-[4-[4-[5-(cyclooctylcarbamoyl)cyclononyl]-2,3-dihydro-1-benzazepine-1-carbonyl]phenyl]-2-(7-oxa-2-azaspiro[3.5]nonan-2-yl)pyridine-3-carboxamide by IUPAC nomenclature, provide its molecular formula.
user
C48H61N5O4
assistant