mPEG8-NHS Product Catalog # Size Price (USD) Quantity mPEG8-NHS281305-500MG500 mg$400.00 - mPEG8-NHS-500mg quantity + mPEG8-NHS281305-1G1 g$600.00 - mPEG8-NHS-1g quantity + Add to cart Description CAS #: 1316189-13-5 Molecular Formula: C24H43NO13 Molecular Weight: 553.6