C = Atom('C')
C_alpha = Atom('CH')
N = Atom('NH2')
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 = {O: 'O', N: 'N3', C_alpha: 'CT', C: 'C', }
name = 'peptide in proline N terminus'
