<html><body><div style="color:#000; background-color:#fff; font-family:times new roman, new york, times, serif;font-size:12pt"><div>sir</div><div> When I retrieve a ligand structure in SDF files from PDB site, it contains many ligand, how to get a single ligand ??? also ligand files are why not available in PDB files ?? I have to covert them in Chimera..... </div></div></body></html>