1-Anthracenesulfonic acid, 9,10-dihydro-9,10-dioxo-, ammonium salt (1:1); 1-Anthraquinonesulfonic acid, ammonium salt;1-Anthracenesulfonic acid, 9,10-dihydro-9,10-dioxo-, ammonium salt; Ammonium 9,10-dihydro-9,10-dioxoanthracene-1-sulphonate; 9,10-dioxo-9,10-dihydroanthracene-1-sulfonic acid ammoniate (1:1)