Drometrizole trisiloxane
IUPAC name	2-(2H-Benzotriazol-2-yl)-4-methyl-6-[2-methyl-3-[1,3,3,3-tetramethyl-1-[(trimethylsilyl)oxy]-1-disiloxanyl]propyl]phenol
Other names	Mexoryl XL; OR 10154; Silatrizole
Identifiers
CAS number	155633-54-8
SMILES	CC1=CC(N3N=C2C=CC=CC2=N3)=C(O)C(CC(C)C[Si](O[Si](C)(C)C)(O[Si](C)(C)C)C)=C1
Properties
Molecular formula	C24H39N3O3Si3
Molar mass	501.84 g mol−1
Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa)
Infobox references

Drometrizole trisiloxane (INCI) is a lipophilic benzotriazole derivative marketed as Mexoryl XL by L'Oréal and is used in sunscreens to absorb UV radiation. It is a broad spectrum UV absorber with two absorption peaks, one at 303 nm (UVB) and one at 344 nm (UVA). Just like Mexoryl SX (ecamsule) it is exclusively used in products by L'Oréal owned brands. Drometrizole trisiloxane and ecamsule are often used together, because they show a synergistic effect in protection.^[1]

[edit] Availability

Sunscreens with drometrizole trisiloxane are approved within the EU,^[2] Canada,^[3] Australia,^[4] Japan,^[5] and other countries, but not in the United States.

[edit] References