mPEG12-NHS Product Catalog # Size Price (USD) Quantity mPEG12-NHS281310-250MG250 mg$358.00 - mPEG12-NHS-250mg quantity + mPEG12-NHS281310-1G1 g$879.00 - mPEG12-NHS-1g quantity + Add to cart Description Molecular Formula: C32H59NO17 Molecular Weight: 729.8