Fluorescent brightener 220

Fluorescent brightener 220, an optical brightener dye, is a chemical compound that is often used to enhance the appearance of color of fabric and paper, making materials appear whiter and more vivid under UV light.

OCCN(C1=NC(NC2=CC=C(C=C2)S(=O)([O-])=O)=NC(NC3=CC(S(=O)([O-])=O)=C(C=C3)/C=C/C4=C(C=C(C=C4)NC5=NC(NC6=CC=C(C=C6)S(=O)([O-])=O)=NC(N(CCO)CCO)=N5)S(=O)([O-])=O)=N1)CCO.[Na+].[Na+].[Na+].[Na+]