how to keep aromatic ring flat

From: Qing Zhang <>
Date: Fri 14 Jun 2002 16:00:51 -0700 (PDT)

Dear Amber users:

A six-membered aromatic carbon ring is clearly
distorted somehow after I run a few hundred steps of
minimization with sander. But this ring should be
almost flat in chemistry. I already use "improper" on
each sp2 carbon in its Prep file.

Does anyone know how to keep the aromatic ring flat
during minimization or dynamics?

Thanks a lot,


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Received on Fri Jun 14 2002 - 16:00:51 PDT
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