sidechain = Group('cyx_sidechain')
peptide = Group('peptide_ct')
bonds = [Bond(peptide.C_alpha, sidechain.C_beta), ]
symbol = 'Cyx'
amber_charge = {peptide.O_2: -0.8041, sidechain.H_beta_3: 0.1228, sidechain.C_beta: -0.1943, peptide.N: -0.3821, sidechain.S_gamma: -0.0529, peptide.H_alpha: 0.0938, peptide.O: -0.8041, peptide.H: 0.2681, sidechain.H_beta_2: 0.1228, peptide.C_alpha: -0.1318, peptide.C: 0.7618, }
name = 'cystine (s-s_bridge)'
chain_links = [peptide.N, None]
