aromatic ether organobromine compound 2,2',4,4',5,5'-Hexabromodiphenyl ether RZXIRSKYBISPGF-UHFFFAOYSA-N chebi_ontology 637.53624 InChI=1S/C12H4Br6O/c13-5-1-9(17)11(3-7(5)15)19-12-4-8(16)6(14)2-10(12)18/h1-4H BDE 153 Brc1cc(Br)c(Oc2cc(Br)c(Br)cc2Br)cc1Br 0 643.58400 CHEBI:81534 HMDB:HMDB0037525 KEGG:C18137 C12H4Br6O CAS:68631-49-2