(4-Bromophenyl)phosphonic acid (p-Bromophenyl)phosphonic acid 16839-13-7 4-16-00-01083 (Beilstein Handbook Reference) BRN 2936778 NSC 13558 Phosphonic acid, (4-bromophenyl)- (9CI) Phosphonic acid, (p-bromophenyl)- p-Bromobenzenephosphonic acid