GSP4PDB is a user-friendly and efficient application to search and discover new patterns of protein-ligand interaction.
GSP4PDB is part of the services provided by the Bioinformatic Group of the University of Talca
http://gdblab.com/gsp4pdb/gsp4pdb2/
https://bmcbioinformatics.biomedcentral.com/articles/10.1186/s12859-020-3352-x