1. In the present context a ligand (e.g. endogenous substances like hormones or neurotransmitters or xenobiotics like any synthetic drug) is defined as a “small molecule” which interacts with a macromolecular target like a protein receptor a polynucleotide (DNA RNA) or an enzyme
2. Hydrated sodium thiocyanate complex of 1,4,7,10,13,16-hexaoxacyclooctadecane
3. Potassium thiocyanate complex of 1,4,7,10,13,16-hexaoxacyclooctadecane
4. Small‐molecule crystal structures are identified by their Cambridge Structural Database (CSD) refcodes as described in Chapter 3. Protein crystal structures are identified by their Protein Data Bank four‐symbol refcodes. Short format references for both types of refcodes are given in Appendix B.