You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
4,18-diisocyano-11-[9-(2-phenylquinazolin-4-yl)carbazol-3-yl]-8,14-dioxa-1-azapentacyclo[11.7.1.02,7.09,21.015,20]henicosa-2,4,6,9,11,13(21),15,17,19-nonaene-6,16-dicarbonitrile The above is the IUPAC name of a molecule. Write its molecular formula.
user
C48H22N8O2
assistant