Sulisobenzone (benzophenone-4) is an ingredient in some

sunscreen Sunscreen, also known as sunblock or sun cream, is a photoprotective topical product for the skin that mainly absorbs, or to a much lesser extent reflects, some of the sun's ultraviolet (UV) radiation and thus helps protect against sunburn and ...

s which protects the skin from damage by UVB and UVA ultraviolet light.Skin cancer foundation: Understanding UVA and UVB
/ref> Its sodium salt, sulisobenzone sodium, is also referred to as benzophenone-5.

References

Benzenesulfonic acids Sunscreening agents Phenols Phenol ethers Benzophenones {{ketone-stub