猩红酸是一款
化工原料，分子式为C21H16N2O9S2，分子量是504.4897。
中文别名：双J酸;6,6'-(1,3-亚基)双(1,1'-
萘酚)-3,3'-
磺酸;7,7-(
羰基二
亚氨基)二(4-羟基-2-磺酸)
英文别名:7,7-(carbonyldiimino)
胺醚[4-hydroxy-2-naphthalenesulfonic acid]; 5,5-DIHYDROXY-7,7-DISULPHO-2,2-DINAPHTHYL
尿素; J Acid
尿素;
胺醚J Acid; 4,4'-dihydroxy-7,7'-ureylenedi(naphthalene-2-sulphonic acid); 7,7'-(Carbonyldiimino)bis[4-hydroxy-2-naphthalenesulfonic acid]; 6,6'-ureylene-bis(1-naphthol-3-sulfonic acid); phosgenated; N,N'-bis(4-hydroxy-2-sulfonaphthalene-7-yl)
尿素; 7,7'-Ureylenebis(4-hydroxy-2-naphthalenesulfonic acid); N,N'-
胺醚[6-(1-naphthol-3-sulfonic acid)]urea; 2-Naphthalenesulfonic acid, 7,7-(carbonyldiimino)
胺醚4-hydroxy-; 4-hydroxy-7-{[(5-hydroxy-7-sulfonaphthalen-2-yl)carbamoyl]amino}naphthalene-2-sulfonic acid
为
偶氮染料用的中间体，用于制造直接橙S、直接耐酸大红4BS等。