Cresyl saligenin phosphate makes multiple adducts on free histidine, but does not form an adduct on histidine 438 of human butyrylcholinesterase

► Free l-histidine makes multiple adducts with CBDP. ► His-438 of human BChE is not alkylated by CBDP. ► Lys-499 of human BChE forms o-hydroxybenzyl adduct upon reaction with CBDP.