You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
tert-butyl 2-[1-(5-cyclohexylpyridin-3-yl)cyclopropyl]-4-oxo-5,7,8,9-tetrahydro-3H-pyrimido[5,4-c]azepine-6-carboxylate The above is the IUPAC name of a molecule. Write its molecular formula.
user
C27H36N4O3
assistant