Bis(4-isopropylphenyl) (4-(Prop-2-yn-1-yloxy)phenyl) Phosphate is a chemoproteomic probe that mimics the triphenyl phosphate (TPP) structure. Bis(4-isopropylphenyl) (4-(Prop-2-yn-1-yloxy)phenyl) Phosphate is used to identify in vivo biological targets of TPP, an organophosphorus flame retardant.