Hello, kindly try with CHARM GUI -> https://www.charmm-gui.org/.

After Registration process, try with input generation option. There you can upload your polymers and choose various parameters according to your need. Hope it will help.

You can use ParmEd

https://github.com/ParmEd/ParmEd/issues/631

Thank you so much. I will try! Suparna Ghosh

Aashish Bhatt How can you do that with

"amber = pmd.load_file('prmtop', 'inpcrd')" part from swails? I got error

Check the following link.

https://github.com/ParmEd/ParmEd/issues/938

https://www.dlcompbiobiotech.com/2021/06/from-amber-topology-to-gromacs-topology.html

You can also try

ACPYPE

https://pypi.org/project/acpype/

One another option.

Article TopoGromacs: Automated Topology Conversion from CHARMM to Gr...

If your polymer is within 200 atoms

then you can also try

http://zarbi.chem.yale.edu/ligpargen/

You can also look at CHARM-GUI for force field file conversion.

Hopefully, it will help

Best Regards

Aashish

@ Aashish Bhatt

Greatly thank you! It was a big help to me.

Have a good day : -)