CAS 252881-76-8 appears in our catalog under these names: Biotin–PEG3–acid, Biotin-PEG3-acid/ 98.89% (existing batch purity), Biotin-PEG3-propionic acid, Biotin-PEG3-acid 95%, Biotin-PEG3-acid, 95%, 95%. Offered by: GLPBio, TargetMol, Biosynth, Ambeed, Chemat. Available pack sizes: 100mg, 25mg, 50mg, 250mg, 1g, 5g, 250 mg, 100 mg.