Octabenzone

Octabenzone
Names
	IUPAC name (2-hydroxy-4-octoxy-phenyl)-phenyl-methanone
	Other names Benzophenone-12, Spectra-Sorb UV 531, MPI Milestab 81
Identifiers
CAS Number	1843-05-6 ;
3D model (JSmol)	Interactive image;
ChemSpider	15020 ;
ECHA InfoCard	100.015.838
KEGG	D00441 ;
MeSH	(2-hydroxy-4-(octyloxy)phenyl)phenylmethanone
PubChem CID	15797;
UNII	73P3618V2E ;
CompTox Dashboard (EPA)	DTXSID9027441 ;
	InChI InChI=1S/C21H26O3/c1-2-3-4-5-6-10-15-24-18-13-14-19(20(22)16-18)21(23)17-11-8-7-9-12-17/h7-9,11-14,16,22H,2-6,10,15H2,1H3 Key: QUAMTGJKVDWJEQ-UHFFFAOYSA-N ; InChI=1/C21H26O3/c1-2-3-4-5-6-10-15-24-18-13-14-19(20(22)16-18)21(23)17-11-8-7-9-12-17/h7-9,11-14,16,22H,2-6,10,15H2,1H3 Key: QUAMTGJKVDWJEQ-UHFFFAOYAM;
	SMILES O=C(c1ccc(OCCCCCCCC)cc1O)c2ccccc2;
Properties
Chemical formula	C21H26O3
Molar mass	326.429 g/mol
Melting point	47–49 °C (117–120 °F; 320–322 K)
	Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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	Infobox references

Octabenzone (Spectra-Sorb UV 531, MPI Milestab 81) is a UV absorber/screener. It is used to protect polymers (e.g., polyethylene, polypropylene, polyvinylchloride) against damage by UV light.

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