mPEG3-NHS Product Catalog # Size Price (USD) Quantity mPEG3-NHS281301-1G1 g$242.00 - mPEG3-NHS-1g quantity + mPEG3-NHS281301-5G5 g$545.00 - mPEG3-NHS-5g quantity + Add to cart Description CAS #: 622405-78-1 Molecular Formula: C14H23NO8 Molecular Weight: 333.3