sidechain = Group('cyx_sidechain_uni')
peptide = Group('peptide_ct_uni')
bonds = [Bond(peptide.C_alpha, sidechain.C_beta), ]
symbol = 'Cyx'
amber91_charge = {peptide.N: -0.52, sidechain.LP_2: -0.4045, sidechain.S_gamma: 0.824, peptide.H: 0.248, sidechain.C_beta: 0.143, peptide.C: 0.444, sidechain.LP_1: -0.4045, peptide.O_2: -0.706, peptide.C_alpha: 0.082, peptide.O: -0.706, }
name = 'cystine (s-s_bridge)'
chain_links = [peptide.N, None]
