Dear Glycam Users,

                 I am using Amber16 package and glycam force filed for MD simulation. My ligand file containing sialic acid and I substitute fluorine atom into O4 position of sialic acid. During the preparation of topology and parameter files via tleap module of Amber, I have the Fatal error as "Atom does not have file type" for fluorine atom. How can I parameterize fluorine atom.
                                        Thanks in Advance
with regards
R. A. Jeyaram
Research Scholar
School of Advanced Sciences
Vellore Institute of Technology
Tamil Nadu, India.