Prestwick Drug-Fragment Library

Prestwick Drug-Fragment Library:
1456 fragments arising from
smart fragmentation of approved drugs

Acknowledged as powerful tool for successful identification of lead series, fragment-based drug design is widely implemented in industry and academia. The fragment-based drug discovery (FBDD) has emerged as an alternative approach to traditional lead identification via high-throughput screening. Unlike other screening approaches, FBDD identifies smaller compounds, which bind to different parts of a biological target.

The primary rationale for fragment-based screening is that the identified hits give access to a broader chemical space while screening a limited number of compounds. FBDD gives a better chance for the final lead compound to have standard drug-likeness parameters. On the other hand, they are simpler molecules (fragments) with fewer unavoidable interactions and, thus, a much better possibility of orienting within the binding site favorably.

To meet researchers’ expectations in this field, an in-house team of medicinal chemists has designed a unique collection of 1456 small molecules (MW<300) arising from the smart fragmentation of approved drugs (1500 drugs, up to year 2016).


Prestwick Drug-Fragment Library: An original collection of fragments derived from approved drugs

  • Balanced set of Ro3 compliant (55%) and Ro3 non-compliant (45%) fragments
  • Good coverage of lead-like diversity space
  • High-quality hits increased by using fragments derived from approved drugs
  • Rapid follow-up on primary hits possible
  • Experimental solubility in DMSO (100 mM) and PBS (1 mM) assessed
  • Purity 95%+ (H NMR spectrum and LC/MS available)
  • Mean MW: 182
    • 56% of fragments are exclusive to the Prestwick Drug-Fragment Library and cannot be found in any other major supplier of fragment libraries
    • >80%  of the recent approved drugs contain at least one of the Prestwick Drug-Fragments Library.


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Prestwick Drug Fragment Library: Examples

Prestwick Drug-Fragment Library: Multi-format and highly customizable


Format Comments
Core set
480 cpds
  • DMSO solution (up to 100 mM)
  • DMSO-d6 solution
    (up to 100 mM)
Representative set of the entire library
Ready for Screening
Highly recommanded for rapid outcomes
Complete library
  • Undissolved (>10 mg)
Available for cherry picking
  • Undissolved (>10 mg)
  • DMSO solution (up to 100 mM)
Selection based on your own criteria
(physicochemical properties, substructure or similarity search)
In any case: Resupply guaranteed up to 100mg


Prestwick Drug-Fragment Library: Applications in FBBD and more classical screening

  • Fragment-based screening using high-concentration bioassays, surface plasmon resonance (SPR), microscale thermophoresis (MST), differential scanning fluorimetry (DSF) (also termed fluorescent thermal shift assay; FTSA), X-Ray crystallography and nuclear magnetic resonance (NMR)
  • HTS for small molecules
  • Screening on living cells or cell lysates for target identification & validation


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