Mal-PEG2-COOH Product Catalog # Size Price (USD) Quantity Mal-PEG2-COOH285701-500MG500 mg$343.00 - Mal-PEG2-COOH-500mg quantity + Mal-PEG2-COOH285701-1G1 g$560.00 - Mal-PEG2-COOH-1g quantity + Add to cart Description CAS #: 756525-98-1 Molecular Formula: C14H20N2O7 Molecular Weight: 328.3