You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
5-[[(6bR)-1-(5,6-dichloro-1H-benzimidazol-2-yl)-1a,6b-dihydro-1H-cyclopropa[b][1]benzofuran-5-yl]oxy]-3,4-dihydro-1H-1,8-naphthyridin-2-one is the IUPAC name of a molecule. Please give its molecular formula.
user
C24H16Cl2N4O3
assistant