English alias:4,5-Diaza-2',7'-dibroMo-9,9'-spirobifluorene;4,5-Diaza-2’,7’-dibromo-9,9’-spirobifluorene;2',7'-Dibromospiro[cyclopenta[1,2-b:5,4-b']dipyridine-5,9'-fluorene];C12=CC=CN=C2C2=NC=CC=C2C21C1=CC(Br)=CC=C1C1=CC=C(Br)C=C12;2,7-Dibromospiro[9H-fluorene-9,5'-[5H]cyclopenta[2,1-b:3,4-b']dipyridine]