CAS 78274-32-5 appears in our catalog under these names: METHOXYPOLYETHYLENE GLYCOL SUCCINATE N-&, Methoxypolyethylene glycol succinimidyl succinate, ≥90%, MW 5000 Da, ≥90%, MW 5000 Da, Methoxypolyethylene glycol succinimidyl succinate. Offered by: Sigma-Aldrich, Chemat, MedChemExpress. Available pack sizes: 1G, 250MG, 250 mg.