sidechain = Group('cyx_sidechain_noh')
peptide = Group('peptide_ct_noh')
bonds = [Bond(peptide.C_alpha, sidechain.C_beta), ]
symbol = 'Cyx'
amber_charge = {peptide.O: -0.8041, sidechain.C_beta: -0.1943, peptide.C: 0.7618, peptide.N: -0.3821, peptide.O_2: -0.8041, sidechain.S_gamma: -0.0529, peptide.C_alpha: -0.1318, }
name = 'cystine (s-s_bridge)'
chain_links = [peptide.N, None]
