mPEG48-NHS Product Catalog # Size Price (USD) Quantity mPEG48-NHS281314-250MG250 mg$836.00 - mPEG48-NHS-250mg quantity + mPEG48-NHS281314-1G1 g$1,953.00 - mPEG48-NHS-1g quantity + Add to cart Description Molecular Formula: C104H203NO53 Molecular Weight: 2315.7