C_beta = Atom('CH2')
O_gamma = Atom('OH')
bonds = [Bond(O_gamma, C_beta), ]
pdbmap = [('SER', {'CB': C_beta, 'OG': O_gamma, }, ), ]
pdb_alternative = {'HG1': 'HG', }
amber_atom_type = {O_gamma: 'OH', C_beta: 'CT', }
name = 'ser_sidechain'
