You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
1-[9-(bicyclo[4.1.0]heptane-7-carbonyl)-6-(2-methylpropyl)-2,6,9-triazabicyclo[9.4.0]pentadeca-1(15),11,13-trien-2-yl]ethanone is the IUPAC name of a molecule. Please give its molecular formula.
user
C26H39N3O2
assistant