sidechain = Group('pro_sidechain_noh')
peptide = Group('peptide_proline_noh')
bonds = [Bond(peptide.C_alpha, sidechain.C_beta), Bond(peptide.N, sidechain.C_delta), ]
symbol = 'Pro'
amber_charge = {sidechain.C_beta: -0.007, peptide.O: -0.5748, sidechain.C_gamma: 0.0189, peptide.C: 0.5896, sidechain.C_delta: 0.0192, peptide.C_alpha: -0.0266, peptide.N: -0.2548, }
name = 'proline'
chain_links = [peptide.N, peptide.C]
