mPEG4-NHS Product Catalog # Size Price (USD) Quantity mPEG4-NHS281302-1G1 g$297.00 - mPEG4-NHS-1g quantity + mPEG4-NHS281302-5G5 g$653.00 - mPEG4-NHS-5g quantity + Add to cart Description CAS #: 874208-94-3 Molecular Formula: C16H27NO9 Molecular Weight: 377.4