Re:

From: Jeff Comer (jeffcomer_at_gmail.com)
Date: Wed Apr 13 2016 - 08:32:23 CDT

Urea is part of the standard CGenFF distribution:

http://mackerell.umaryland.edu/~kenno/cgenff/download.php#latest
http://mackerell.umaryland.edu/charmm_ff.shtml#charmm

I'm not sure about the molecule, but you can probably generate a topology
with ParamChem:

https://cgenff.paramchem.org/

–––––––––––––––––––––––––––––––––––———————
Jeffrey Comer, PhD
Assistant Professor
Institute of Computational Comparative Medicine
Nanotechnology Innovation Center of Kansas State
Kansas State University
Office: P-213 Mosier Hall
Phone: 785-532-6311
Website: http://jeffcomer.us

On Wed, Apr 13, 2016 at 7:08 AM, Srijita Paul <srijitap91_at_gmail.com> wrote:

> Hi,
> Anybody can help me by providing the charm topology file for urea and
> choline-o-sulfate for creating psf file in psfgen.If psf file is available
> u can provide it also.
> thank you
>

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