Feb. 18,2021  17  US 2021/0048748 Al  Br  b-Ofu-0-0  B,-Q-0 H,N-Q-0  NH2  Br  Br  Br  -Q-0)-Q-O  Br  Br  Br  Br  B,-Q-o B,*o  Br  Br  Br  Br  fu*O B,-Q-0  >-- NH  Br  HO  Br  0  __;=(_  Br  Br~o- Br  o- H  0  [0058]  The ammonium salt having formula (A) may be  synthesized, for example, by neutralization reaction of an  iodized aromatic ring-containing amine compound capable  of providing the cation of the ammonium salt and an iodized  or brominated phenol.  R,*00-00-0  HO  Br  I  I  F  Q-OP-OP-0  F  F  I  <=to <=to ,-q-o  F  F  F  I  F  R-o ,-p-o  F  F  I  sio ,-y-o ,-q-o  F  F  I  F  F  c*o->--d-o  I  F  I  I  0--0-0 NC-0-0  o,N-d-o _)--6-o  -continued  -continued 