Wiktionary
sulisobenzone
n. An ingredient in some sunscreens which protects the skin from damage.
Wikipedia
Sulisobenzone
Sulisobenzone (benzophenone-4) is an ingredient in some sunscreens which protects the skin from damage by UVB and short-wave UVA ultraviolet light.
Its sodium salt, sulisobenzone sodium, is also referred to as benzophenone-5.