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