X-Chem’s versatile technology is proven in projects spanning numerous target classes. These include challenging categories such as protein-protein interactions (PPI), bacterial targets, ubiquitin ligases, epigenetic targets and G protein-coupled receptors (GPCR).

Screen Hundreds of Billions of Compounds Against Your Drug Discovery Target

Forms of the DNA-encoded library (DEL) technology that we pioneered are now used around the world as an important method of small molecule discovery. Biotech and pharma companies engaged in lead discovery have quickly recognized the exponential advantages of being able to screen billions of compounds with astonishing speed and efficiency, compared with industry-standard, high-throughput screening processes.


Combinational Chemistry, DNA Tagging and High Affinity-Based Screening


The X-Chem drug discovery engine is based on a compound library generated by iterative combinatorial synthesis. In the DEL process, each molecule in the library is tethered to a distinct DNA tag or “bar code” that records its synthetic history.


Billions of small molecules are screened as a mixture in a single vessel against a target of interest. Conducting multiple screening experiments in parallel provides informative and actionable output.


DNA amplification and sequencing methods are then used to identify the molecules that have an affinity for your target.


Proprietary bioinformatics tools allow the translation of DNA sequence data into chemical structure, and the analysis of the enrichment and structural characteristics of the resulting ligands.


Based on the synthetic history encoded in the DNA sequence information, promising molecules are then synthesized without the DNA tag attached.


These de-tagged hits are then retested in biological assays to confirm that they exhibit the desired activity. The structure-activity relationships observed in the screening help accelerate hit-to-lead medicinal chemistry.

Whether you are a DEL practitioner or an investigator looking for equity against a novel target, we will help you leverage our platform, technology and expertise in the best way possible.


Therapeutic Areas


Licensed Programs By Target Class


Licensed Programs Over Time

licensed programs over time graph

Proprietary innovations underlie the exceptional performance of the X-Chem platform

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A Superior Approach to Library Design

Our libraries are maximally diverse and designed to generate hit compounds that jump-start medicinal chemistry.

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World Class Selection Expertise

We have developed a myriad of strategies for screening targets under the right conditions to discover hits with the desired mechanisms.


Unique Informatics Tools

Our tools indicate clear direction for pursuing novel compound series with desired selectivity, binding site, and mechanism of action.

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Medicinal Chemistry Capabilities

The output is easily integrated into discovery programs; our medicinal chemistry experts can help you translate high-quality hits into clinical candidates.

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Industrial-Scale Capabilities

We process dozens of screening campaigns each year.

Our platform, libraries and screening strategies are designed to generate compound classes that can address any target and modality:

  • Lead-Like Compounds
  • Drug-Like Compounds
  • Macrocycles
  • Peptides
  • Covalent Inhibitors
  • Protein Degraders
  • Allosteric Inhibitors

Our robust process has been highly successful against targets considered difficult or even intractable, such as:

  • Protein-Protein Interactions
  • Ubiquitin Ligases
  • Epigenetic Targets
  • G Protein-Coupled Receptors
  • Bacterial Enzymes
We will help you leverage our platform, technology and expertise in the best way possible.