scPDB release 2013 online: 9283 entries, 3678 proteins and 5608 ligands
sc-PDB: a 3D-database of ligandable binding sites-10 years on
Desaphy, J.;Bret, G.;Rognan, D. and Kellenberger, E.
Nucleic Acids Res 2014, 10.1093/nar/gku928