IUPAC Name: Disodium4-hydroxy-5-(2-hydroxy-4-methoxy-5-sulfonatobenzoyl)-2-methoxybenzenesulfonate 
Following is the structure of Benzenesulfonic acid,3,3'-carbonylbis[4-hydroxy-6-methoxy-, sodium salt (1:2) (CAS NO.76656-36-5):
                               
Empirical Formula: C₁₅H₁₂Na₂O₁₁S₂
Molecular Weight: 478.3587 
EINECS: 278-520-4 
Melting point of Benzenesulfonic acid,3,3'-carbonylbis[4-hydroxy-6-methoxy-, sodium salt (1:2) (CAS NO.76656-36-5): 350 °C (dec.)
Product Categories of Benzenesulfonic acid,3,3'-carbonylbis[4-hydroxy-6-methoxy-, sodium salt (1:2) (CAS NO.76656-36-5): Hair Care; Home Care; Skin Care; Industrial/Fine Chemicals
Canonical SMILES: COC1=C(C=C(C(=C1)O)C(=O)C2=CC(=C(C=C2O)OC)S(=O)(=O)[O-])S(=O)(=O)[O-].[Na+].[Na+]
InChI: InChI=1S/C15H14O11S2.2Na/c1-25-11-5-9(16)7(3-13(11)27(19,20)21)15(18)8-4-14(28(22,23)24)12(26-2)6-10(8)17;;/h3-6,16-17H,1-2H3,(H,19,20,21)(H,22,23,24);;/q;2*+1/p-2
InChIKey: QDCHWIWENYCPIL-UHFFFAOYSA-L

 Benzenesulfonic acid,3,3'-carbonylbis[4-hydroxy-6-methoxy-, sodium salt (1:2) , its cas register number 76656-36-5. It also can be called  Disodium 2,2'-dihydroxy-4,4'-dimethoxy-5,5'-disulfobenzophenone ; 2,2'-Dihydroxy-4,4'-dimethoxybenzophenone-5,5'-disulfonic acid disodium salt ; and Benzophenone-9 .