Start organic synthesis with Molport

Working on synthesis of new compounds, delivering a combinatorial chemistry project, or designing DNA Encoded Library? We offer a diverse range of in-stock building blocks in pack sizes from 50 mg to 10 kg with next-day delivery on many products.


Global Suppliers


Stock Building blocks


Made To Order Building Blocks

Know what’s available now

No more out-of-stock searches. We sync 50% of our building block inventory daily with suppliers to make sure we know exactly what’s in stock.

Purity you can rely on

Don’t compromise your project. When purity counts, 96% of our stock is 95%+ purity and sourced from fully-vetted suppliers.

Lead times that lead the way

Receive in-stock building blocks as quickly as the next day. Made-to-order lead times may take up to 30 days

Largest shop suppliers:

  • Fluorochem Limited
  • BLD Pharmatech Ltd.
  • MedChemExpress Europe
  • Chemscene
  • Synthonix
  • Aldlab
  • ChemDiv, Inc.
  • AK Scientific, Inc.
  • A1 BioChem Labs LLC
  • Apollo Scientific

Largest Chemical Classes:

  • Acid Chloride
  • Carboxylic Acid
  • Sulfonyl Chloride
  • Amine
  • Boronic Acid
  • Isocyanate
  • Alcohol
  • Aldehyde
  • Halogen
  • Azide

Find and purchase building blocks via:

Online Search Tools
By CAS numbers, Molport IDs, supplier catalog numbers, etc.
FTP & API Database
Access contains price ranges, stock amount, QC method, lead time, etc.
List search
Optimize longer list- immediate price offer, segment suppliers, apply chemical filters, etc
Punchout integration
Integrate with your purchasing system for faster order processing

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