Avobenzone is an oil soluble ingredient used in sunscreen

Sunscreen

Sunblock is a lotion, spray, gel or other topical product that absorbs or reflects some of the sun's ultraviolet radiation on the skin exposed to sunlight and thus helps protect against sunburn...

 products to absorb the full spectrum of UVA

Ultraviolet

Ultraviolet light is electromagnetic radiation with a wavelength shorter than that of visible light, but longer than X-rays, in the range 10 nm to 400 nm, and energies from 3 eV to 124 eV...

 rays.
It is a dibenzoylmethane

Dibenzoylmethane

1,3-diphenylpropane-1,3-dione is an aromatic 1,3-diketone, acetylacetone derivative, where both methyl groups have been substituted by phenyl groups. It is white solid melting 77-78°C. Similiary to acac, DBM exist as two tautomeric forms, however keto-enol equilibrium of DBM is strongly shifted...

 derivative. Avobenzone exists in the ground state as a mixture of the enol and keto forms, favoring the chelated enol. Its ability to absorb ultraviolet light over a wider range of wavelengths than many organic sunscreen agents has led to its use in many commercial preparations marketed as "broad spectrum" sunscreens.