The PDBeChem (MSDchem) service of the European Bioinformatics Institute provides information on all ligands found in PDB structures. The MSD people have done their best to clean up the ligand information in the PDB (which for old files was often not consistent) and they provide a ligand dictionary, where stereochemistry, charges and the correct connectivity are respected. In addition they provide search facilities, optimised 3D coordinates for all ligands and additional information such as precalculated 2D fingerprints.