mPEG4-OH Product Catalog # Size Price (USD) Quantity mPEG4-OH281402-5G5 g$245.00 - mPEG4-OH-5g quantity + mPEG4-OH281402-25G25 g$550.00 - mPEG4-OH-25g quantity + Add to cart Description Synonym: Tetraethylene Glycol Monomethyl Ether CAS #: 23783-42-8 Molecular Formula: C9H20O5 Molecular Weight: 208.3