C.I. Acid Blue 40; Acid Blue 40; Acid Blue 40 (C.I.); sodium 4-(4-acetamidophenyl-1-amino)-1-amino-9,10-dioxoanthracene-2-sulphonate; Acid Blue 40; 2-anthracenesulfonic acid, 4-[[4-(acetylamino)phenyl]amino]-1-amino-9,10-dihydro-9,10-dioxo-, sodium salt (1:1); sodium 4-{[4-(acetylamino)phenyl]amino}-1-amino-9,10-dioxo-9,10-dihydroanthracene-2-sulfonate