CAS 55683-37-9 appears in our catalog under these names: Propargyl–PEG1–acid, Propargyl-PEG1-acid 95%, PROPARGYL-PEG1-ACID, 3-(Prop-2-yn-1-yloxy)propanoic acid, 97%, 97%, Propargyl-PEG1-acid, 97.0%. Offered by: GLPBio, Ambeed, Sigma-Aldrich, Chemat, MedChemExpress. Available pack sizes: 100mg, 250mg, 1g, 5g, 25g, 50MG, 10g, 5 g.