2-Hydroxyethyl methacrylate-13C is the 13C--labeled 2-Hydroxyethyl methacrylate (HY-W012723). 2-Hydroxyethyl methacrylate (HEMA) is a monomer used in the synthesis of various polymers, and the polymer PHEMA of 2-Hydroxyethyl methacrylate is widely used in the synthesis of dental composite materials[1][2].