What is in sodium benzotriazolyl butylphenol sulfonate?

SODIUM BENZOTRIAZOLYL BUTYLPHENOL SULFONATE is a UV light stabilization ingredient that protects colors and other light-sensitive ingredients from photolytic and/or photo-oxidative degradation and thus improve the stability of colors (of both natural and synthetics origins) in formulations of personal care products which are exposed to UV-A and UV-B light.