AMBER Archive (2008)

Subject: Re: AMBER: Re: Force field parameter file for CNT

From: David A. Case (
Date: Fri Feb 29 2008 - 10:19:47 CST

On Thu, Feb 28, 2008, Andrey Semichaevsky wrote:
> I figured out from previous postings that leaprc.ff23 force field
> parameter file is required for the CNT simulations. However, I could
> not find it among the standard Amber 8 or Amber 9 files. Could you
> please let me know where I can it. Thanks.

There is no such beast. We won't release ff23 until 2023. :-)

I'm not sure what a "CNT simulation is", or why it would need a particular
force field. Be aware that not all "previous postings" are correct, or are
without typos. It could be that you are looking for leaprc.ff03, but that is
just a complete guess.


The AMBER Mail Reflector
To post, send mail to
To unsubscribe, send "unsubscribe amber" to