Dna fragments (DA, DT, DG) are not recognized by schrodinger for docking

Hi all

I have a pdb file from Gromacs output which contains a protein and DNA with DA, DT, DG and DC fragments and this cant be recognized as an input file by Schrodinger to do dockings with a drug. How can I convert the file to the format readable by Schrodinger? Is there a server or script for doing that?
Any help would be appreciated.
Thank you.

This is probably a better question for Schrodinger support, or their documentation.