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Hello, how does one specify C-terminal amidation of a peptide for REFMAC refinement? I intended to prepare link restraints between the C-terminal amino acid residue and a residue "NH2". But JLIGAND reports "Code 'NH2' does not exist in the library". On my system, $CLIB/data/monomers/n/NH2.cif exists, but may be JLIGAND searches elsewhere? Or should I follow a different procedure for restraint preparation altogether? Thank you, Wolfram Tempel