mPEG5-NHS Product Catalog # Size Price (USD) Quantity mPEG5-NHS281303-1G1 g$306.00 - mPEG5-NHS-1g quantity + mPEG5-NHS281303-5G5 g$688.00 - mPEG5-NHS-5g quantity + Add to cart Description CAS #: 1449390-12-8 Molecular Formula: C18H31NO10 Molecular Weight: 421.4