sidechain = Group('cys_sidechain')
peptide = Group('peptide')
bonds = [Bond(peptide.C_alpha, sidechain.C_beta), ]
symbol = 'Cys'
amber_charge = {peptide.O: -0.5679, sidechain.H_beta_2: 0.1112, sidechain.H_beta_3: 0.1112, peptide.H_alpha: 0.1124, peptide.H: 0.2719, peptide.N: -0.4157, sidechain.H_gamma: 0.1933, sidechain.S_gamma: -0.3119, peptide.C_alpha: 0.0213, sidechain.C_beta: -0.1231, peptide.C: 0.5973, }
name = 'cysteine'
chain_links = [peptide.N, peptide.C]
