6,6'-Oxybis(2-naphthalenesulfonate) (sodium salt)

6,6'-Oxybis(2-naphthalenesulfonate) is a byproduct in the synthesis of FD&C Yellow No. 6 and FD&C Red No. 40 (Allura Red AC, Item No. 44514). It is formed during the synthesis of Schaeffer's salt, an intermediate used in the synthesis of FD&C Yellow No. 6. 6,6'-Oxybis(2-naphthalenesulfonate) is also an impurity formed in the synthesis of FD&C Yellow No. 5.. SMILES: [O-]S(=O)(C1=CC=C2C=C(OC3=CC4=CC=C(S([O-])(=O)=O)C=C4C=C3)C=CC2=C1)=O.[Na+].[Na+]. InChi Code: InChI=1S/C20H14O7S2.2Na/c21-28(22,23)19-7-3-13-9-17(5-1-15(13)11-19)27-18-6-2-16-12-20(29(24,25)26)8-4-14(16)10-18,,/h1-12H,(H,21,22,23)(H,24,25,26),,/q,2*+1/p-2. InChi Key: FBGQGMKNWOSSAG-UHFFFAOYSA-L