You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named 3-methyl-N-[2-[4-[6-(4-methylphenyl)pyridazin-3-yl]-1,4-diazepan-1-yl]-2-oxoethyl]-N-(oxolan-2-ylmethyl)butanamide by IUPAC nomenclature, provide its molecular formula.
user
C28H39N5O3
assistant