Synonyms: 2,4,8,10-Tetraoxa-3,9-diphosphaspiro[5.5]undecane-3,9-diamine,N,N'-bis(4-bromophenyl)-, 3,9-dioxide (9CI); Phosphoramidic acid,(p-bromophenyl)-, cyclic neopentanetetrayl ester (8CI);3,9-Bis(N-p-bromophenylamino)-2,4,8,10-tetraoxa-3,9-diphosphaspiro[5.5]undecane-3,9-dioxide;NSC 86285