REAL Space

The World's Largest Make-on-Demand Chemical Space for Drug Discovery

Enamine's REAL Space (REadily AccessibLe) is the world's largest make-on-demand compound collection for early-stage drug discovery. Built from Enamine's in-house parallel chemistry expertise, it provides a combinatorially generated universe of drug-like molecules that can be synthesized, ordered, and delivered to your lab. Synthesis is completed in 3–4 weeks with an average success rate of over 80%.

The current release features 94.5 billion drug-like structures that can be searched and ordered directly. Every retrieved compound is ready to order from Enamine and delivered to your lab.

  • Make-on-demand: synthesized to order and delivered to your lab
  • Drug-like physicochemical properties (Ro5 and Veber compliant)
  • Rapid synthesis and delivery: 3–4 weeks, over 80% success rate
  • Constantly growing: regular updates with new reactions and building blocks
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9.5 x 1010
REAL Space

The 'Almost' 100 Billion Update: A New Order of Magnitude

The latest version of REAL Space is built on a continuously refined foundation of Enamine's in-house synthesis expertise. All results found using BioSolveIT's tools are ready to order directly from Enamine, with fast and reliable delivery to your lab.

173
Curated parallel synthesis reactions
202,620
In-stock reagents and building blocks
94.5 B
Virtual products, searchable and orderable

All results found using BioSolveIT's tools are ready to order directly from Enamine, with fast and reliable delivery to your lab.

What Makes REAL Space Unique?

REAL Space is built entirely from Enamine's validated parallel synthesis protocols applied to in-stock building blocks. Every virtual product reflects chemistry that Enamine can perform at scale, ensuring a direct path from in silico hit to orderable compound.

  • Synthetically validated chemistry: Every compound is the product of a validated protocol applied to in-stock reagents at Enamine. The space reflects real, performable chemistry, not speculative enumeration.
  • Make-on-demand with reliable delivery: Compounds are synthesized to order within 3–4 weeks at a success rate exceeding 80%. Hits found in silico translate directly into physically accessible matter.
  • Beyond availability bias: REAL Space covers a broad, IP-free chemical universe, giving searches access to novel scaffolds and analogs not represented in standard in-stock collections.
  • Efficient on standard hardware: Despite containing over 94 billion structures, the REAL Space file is a few hundred megabytes. Searches run on a standard workstation in 2–4 minutes on average.
  • Two access modes: Available as an enumerated dataset and as a synthon-based combinatorial space, where results are generated on the fly to match the query.

The Evolution of REAL Space

Since its first public release, REAL Space has grown by nearly three orders of magnitude, from 120 million compounds to over 94 billion today. The table below traces that growth across every documented release.

Release Compounds Scale
ZINC15 120 M
2018-Q1 650 M
2018-Q2 3.8 B
2018-Q4 3.7 B
2019-Q1 5.1 B
2019-Q2 11 B
2019-Q4 13 B
ZINC20 1.8 B
2020-Q2 14 B
2020-Q4 16 B
2021-Q1 18 B
2021-Q2 19 B
2021-Q3 20 B
2021-Q4 21 B
ZINC22 37 B
2022-Q1 23 B
2022-Q2 29 B
2022-Q3 32 B
2022-Q4 34 B
2023-Q1 36 B
2023-Q2 36 B
2023-Q3 44 B
2023-Q4 48 B
2024-Q1 48 B
2024-Q3 70 B
2025-Q1 76 B
2025-Q3 83 B
2026-Q2 95 B
Current ★ 94.5 B

★ Current release per enamine.net. ZINC15, ZINC20, and ZINC22 entries reflect independently curated REAL compound subsets made available through ZINC.

Access with infiniSee

Access with infiniSee

REAL Space can be conveniently explored using BioSolveIT's Chemical Space navigation platform, infiniSee. Over 94 billion entries can be searched for relevant chemistry within seconds to minutes on standard hardware. Various search algorithms are available to identify the best matches for the objectives of a drug discovery project.

  • Scaffold Hopper (FTrees): Retrieves compounds based on fuzzy pharmacophore similarity.
  • Analog Hunter (SpaceLight): Screens for close analogs based on Tanimoto fingerprint similarity.
  • Motif Matcher (SpaceMACS): Mines for molecules containing an exact substructure or those with the highest maximum common substructure to the query.

Of course, REAL Space can also be accessed using the corresponding command-line versions of the modes (FTrees, SpaceLight, SpaceMACS).

Check out infiniSee

Want to Take It into the 3D World?

Chemical Space Docking™ also enables structure-based screening of REAL Space within your target of interest. Executed within our drug design dashboard SeeSAR, molecules forming the most favorable interactions in the binding site can be efficiently mined on standard hardware, and without a connection to the internet.


This allows in-house projects to be streamlined without the involvement of third parties; you will work in a user-friendly environment with full control over your results.

Read about C-S-D

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