libraries.md

@@ -39,7 +39,6 @@ dominated by kinases, GPCRs and ion channels; available for external collaborati
 * [ ] [Reframe](https://reframedb.org/#/assays): A screening library of 12,000 molecules assembled by combining three databases (Clarivate Integrity, GVK Excelra GoStar and Citeline Pharmaprojects) to facilitate drug repurposing.
 * [ ] [Probes&Drugs](https://www.probes-drugs.org/compoundsets) 4050 Probes and 12329 drugs. Public resource joining together focused libraries of bioactive compounds (probes, drugs, specific inhibitor sets etc.) with commercially available screening libraries. 
 
-
 ## Natural product databases
 
 We have a particular interest in natural product (NP) databases, mainly because they are likely to be useful for Global Health research.
@@ -53,6 +52,10 @@ We have a particular interest in natural product (NP) databases, mainly because
 * [ ] [CMAUP](http://bidd2.nus.edu.sg/CMAUP/download.html): Collective Molecular Activities of Useful Plants.
 * [ ] [FooDB](http://foodb.ca/): 24,000 food chemicals
 
+## Purchasable libraries
+
+* [ ] [Chem-Space](https://chem-space.com/compounds). Downloadable compound and target sets.
+
 ## Free collections
 
 * [ ] [Boheringer BI Miner](https://opnme.com/home)