Hi,all

How to use Define Amino Acid Template dialog under the Build and Edit Protein tools?

I use BIOVIA DRAW software to draw a nonstandard amino acid structure and copy or import to Discovery Studio software and  I want to usu Define Amino Acid botton to define a nonstandard amino acid template for mutation, however it told me the following text: The amide carbon appears to be bonded to something other than CA and O atoms.This cannot be used as an amino acid template; This structure does not have valid amino acid backbone.It must have correctly bonded N-CA-C=O, with either normal N and C terminal groups or no termini. It cannot currently be used as an amino acid template. Please check the structure and nomenclature.

The non-standard amino acid I need has a long SGSGSG sequence attached to the amino group of the lysine side chain by a peptide bond: