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AVOBENZONE

Synthetic sunscreen ingredient (also known as Parsol 1789 or butyl methoxydibenzoylmethane) that provides broad-spectrum sun protection by absorbing aging UVA rays. Avobenzone is one of the most widely used UVA filters in the world and has been rigorously tested for safety and efficacy.
To increase its photostability, UV absorbers such as octocrylene and non-UV filters (e.g., diethylhexyl 2, 6-napththalate) often accompany avobenzone in a cosmetic formula. Antioxidants (such as vitamin E and ubiquinone) also show promise for enhancing avobenzoneŠ—Ès photostability.
For more information on the importance of sunscreen and how to apply it, see our article here.
References for this information:

Journal of Applied Pharmaceutical Science, December 2014, pages 35-43

Household and Personal Care Today, March/April 2014, pages 4-8

Journal of Photochemistry and Photobiology B: Biology, 2014, pages 36Š—–40

Indian Journal of Dermatology, September/October 2012, pages 335-342