H2N-PEG4-Propyne Product Catalog # Size Price (USD) Quantity H2N-PEG4-Propyne285402-500MG500 mg$325.00 - H2N-PEG4-Propyne-500mg quantity + H2N-PEG4-Propyne285402-1G1 g$503.00 - H2N-PEG4-Propyne-1g quantity + Add to cart Description CAS #: 1013921-36-2 Molecular Formula: C11H21NO4 Molecular Weight: 231.3