mPEG16-NHS Product Catalog # Size Price (USD) Quantity mPEG16-NHS281311-250MG250 mg$433.00 - mPEG16-NHS-250mg quantity + mPEG16-NHS281311-1G1 g$1,015.00 - mPEG16-NHS-1g quantity + Add to cart Description Molecular Formula: C40H75NO21 Molecular Weight: 906.0