CAS 385437-57-0 appears in our catalog under these names: DSPE-PEG-Biotin (MW 2000)/ 95%, DSPE–PEG–Biotin (MW 2000), DSPE-PEG(2000) BIOTIN, 1,2-distearoyl-sn-glycero-3-phosphoethanolamine-N-[biotinyl(polyethylene glycol)-2000] (ammonium salt), DSPE-PEG-Biotin, MW 2000, 99.93%. Offered by: TargetMol, GLPBio, Sigma-Aldrich, Chemat, MedChemExpress. Available pack sizes: 2mg, 5mg, 10mg, 25mg, 50mg, 100mg, 250mg, 10 mg.