You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
[2-[2-(1H-benzimidazol-2-yl)ethyl]-3,4-dihydro-1H-benzo[b][1,6]naphthyridin-10-yl]-[4-(2-hydroxyethyl)piperazin-1-yl]methanone is the IUPAC name of a molecule. Please give its molecular formula.
user
C28H32N6O2
assistant