Synonyms: 2-Butenedioic acid (2Z)-, polymer with (2Z)-4-amino-4-oxo-2-butenoic acid and ethenylbenzene, ammonium salt;2-Butenedioic acid (Z)-, polymer with (Z)-4-amino-4-oxo-2-butenoic acid and ethenylbenzene, ammonium salt;2-butenedioic acid (z)-, polymer with(z)-4-amino-4-oxo-2-butenoic acid and ethenylbenzene, ammonium salt;2-Butenedioic acid(Z)-,polymer with(Z)-4-amino-4-oxo-2-butenoic acid and ethenylbenzene,ammonium salt;styrene/ maleic acid/ maleamic acid polymer, ammonium salt