C = Atom('C')
C_alpha = Atom('CH')
N = Atom('NH3')
O = Atom('O')
bonds = [Bond(N, C_alpha), Bond(C_alpha, C), Bond(C, O), ]
pdbmap = [('', {'N': N, 'O': O, 'CA': C_alpha, 'C': C, }, ), ]
amber_atom_type = {N: 'N3', O: 'O', C: 'C', C_alpha: 'CT', }
pdb_alternative = {'H1': '1HT', 'H3': '3HT', 'H2': '2HT', }
name = 'peptide N terminus'
