Notes: 2,4’-Dibromoacetophenone is an inhibitor of glycogen synthase kinase 3β (GSK3β; IC50 = 0.5 µM).{67129} It is selective for GSK3β over protein kinase A (PKA; IC50 = >100 µM). It has also been used in the derivatization of lactic acid and glycolic acid prior to analysis by HPLC.{67130}