Biotin-PEG4-amine Product Catalog # Size Price (USD) Quantity Biotin-PEG4-amine271603-500MG500 mg$555.00 - Biotin-PEG4-amine-500mg quantity + Biotin-PEG4-amine271603-1G1 g$850.00 - Biotin-PEG4-amine-1g quantity + Add to cart Description CAS #: 663171-32-2 Molecular Formula: C20H38N4O6S Molecular Weight: 462.6