You can search our products by its CAS#, item# or general keywords. You can also browse our products by searching for terminal functional groups (X and Y) or PEG architecture (multi-arm):
mPEGn-X: products with an inert methoxy (CH3O-, m) group at one end and a functional group X at the other end. X can be -OH, -NH2, -COOH, -NHS ester, -SH, -Maleimide, and more.
X-PEGn-X: homobifunctional PEG products with the same functional group X at both ends. X can be -OH, -NH2, -COOH, -NHS ester, -Maleimide, and more.
X-PEGn-Y: heterobifunctional PEG products with different functional groups X and Y. X and Y can be -OH, -NH2, -COOH, -NHS ester, -SH, -Maleimide, and more.
PX-PEGn-X(Y): homobifunctional or heterobifunctional PEG products in which one functional group is protected by a protecting group, such as Boc, Fmoc, and more.
Multi-Arm PEGn: non-linear PEG products with 2, 3, or 4 arms.
Biotinylation: biotin products having either hydrophobic spacers or hydrophilic PEG spacers.
PEGn: n indicates the number of polyethylene glycol units in the product. A typical range of PEG length that we offer is n = 3~12. In some cases, n can be as large as 16, 20, 24, and more.


During shopping, please choose a product and add it to the shopping cart. After you are finished shopping, please verify your items and the quantity of each in the shopping cart, update your shipping and billing address, choose your shipping method and payment information, and submit your order to us. We will send you an order confirmation once the order is received. We also accept formal purchase orders via fax and email.
A customer service representative is available Monday through Friday 8:00 a.m. to 4:30 p.m. PST.  Order before 3:00 p.m. to receive from same-day shipping. Please contact us if you require a bulk order or need custom synthesis.
Fax: 1-858-408-4567
Phone: 1-888-331-8188
Local: 1-858-455-9778


We accept MasterCard, Visa, American Express, Discover, wire transfer, direct deposit and check. Some international orders may require payment in advance. Our banking information will be on the invoice. We accept Net 30 day payment term. All prices are FOB, San Diego, California and subject to change without notice. Please be noted that all freight, insurance, duty tax and special packaging charges will be added to the invoice unless other arrangements are made.




Carrier: FedEx is our carrier of choice, but other major carriers are also acceptable. We can use your FedEx collect account if provided and not charge you for shipping and handling. For all other orders, shipping and handling will be added to your invoice.
Methods: Please choose International Priority, Standard Overnight, 2-Day, or Pick up (for local area service) and indicate the preferred shipping method on your orders. Orders outside the United States are shipped by FedEx International Priority or DHL International.
Storage: Most of our products are stable at ambient temperatures during shipping; however, storage conditions below -20℃ are advised for long term storage. Please consult storage information when you receive your order.