ALC-0159 is a PEG lipid molecule (i.e. PEGylated lipid), It is the N,N-dimyristylamide of 2-hydroxyacetic acid, O-pegylated to a PEG chain mass of about 2 kilodaltons (corresponding to about 45-46 ethylene oxide units per molecule of N,N-dimyristyl hydroxyacetamide). ALC-0159 is a non-ionic surfactant by its nature and It has been deployed in the Pfizer-BioNTech SARS-CoV-2 mRNA vaccine that contains the active ingredient tozinameran. Reagent grade, for research use only.