C_beta = Atom('CH2')
H_gamma = Atom('H')
O_gamma = Atom('O')
bonds = [Bond(O_gamma, C_beta), Bond(H_gamma, O_gamma), ]
pdbmap = [('SER', {'HG': H_gamma, 'CB': C_beta, 'OG': O_gamma, }, ), ]
pdb_alternative = {'HG1': 'HG', 'HB1': '3HB', 'HOG': 'HG' }
name = 'ser_sidechain'
opls_atom_type = { C_beta: 'C2', O_gamma: 'OH', H_gamma: 'HO'  }
opls_charge = { C_beta: 0.265, O_gamma: -0.7, H_gamma: 0.435  }
amber91_atom_type = {H_gamma: 'HO', O_gamma: 'OH', C_beta: 'C2', }
