Bisdisulizole disodium (INN^[1]/USAN,^[2] trade name Neo Heliopan AP, INCI disodium phenyl dibenzimidazole tetrasulfonate) is a water-soluble organic compound which is added to sunscreen products to absorb UVA rays. It is marketed by Symrise.

Quick Facts Names, Identifiers ...

Bisdisulizole disodium

Names
Preferred IUPAC name Disodium 2,2′-(1,4-phenylene)bis(6-sulfo-1H-1,3-benzimidazole-4-sulfonate)
Identifiers
CAS Number	180898-37-7 Y
3D model (JSmol)	Interactive image
ChEMBL	ChEMBL2111085 N
ChemSpider	9333274 Y
ECHA InfoCard	100.121.951
PubChem CID	11158166
UNII	Z99XUY03BK Y
InChI InChI=1S/C20H14N4O12S4.2Na/c25-37(26,27)11-5-13-17(15(7-11)39(31,32)33)23-19(21-13)9-1-2-10(4-3-9)20-22-14-6-12(38(28,29)30)8-16(18(14)24-20)40(34,35)36;;/h1-8H,(H,21,23)(H,22,24)(H,25,26,27)(H,28,29,30)(H,31,32,33)(H,34,35,36);;/q;2*+1/p-2 Y Key: GLCJMPWWQKKJQZ-UHFFFAOYSA-L Y InChI=1/C20H14N4O12S4.2Na/c25-37(26,27)11-5-13-17(15(7-11)39(31,32)33)23-19(21-13)9-1-2-10(4-3-9)20-22-14-6-12(38(28,29)30)8-16(18(14)24-20)40(34,35)36;;/h1-8H,(H,21,23)(H,22,24)(H,25,26,27)(H,28,29,30)(H,31,32,33)(H,34,35,36);;/q;2*+1/p-2 Key: GLCJMPWWQKKJQZ-NUQVWONBAQ
SMILES C1=CC(=CC=C1C2=NC3=C(C=C(C=C3N2)S(=O)(=O)O)S(=O)(=O)[O-])C4=NC5=C(C=C(C=C5N4)S(=O)(=O)O)S(=O)(=O)[O-].[Na+].[Na+]
Properties
Chemical formula	C20H12N4Na2O12S4
Molar mass	674.55 g·mol−1
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). N verify (what is YN ?) Infobox references

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The use of bisdisulizole disodium has been approved in the European Union (since the year 2000)^[3] and other parts of the world up to 10% in sunscreen formulations,^[4][5][6] while it is not approved in the United States.