C_beta = Atom('CH')
C_gamma_1 = Atom('CH3')
C_gamma_2 = Atom('CH3')
bonds = [Bond(C_gamma_1, C_beta), Bond(C_gamma_2, C_beta), ]
pdbmap = [('VAL', {'CG2': C_gamma_2, 'CB': C_beta, 'CG1': C_gamma_1, }, ), ]
name = 'val_sidechain'
opls_atom_type = { C_beta: 'CZ', C_gamma_1: 'C3', C_gamma_2: 'C3'  }
opls_charge = { C_beta: 0.0, C_gamma_1: 0.0, C_gamma_2: 0.0  }
amber91_atom_type = {C_gamma_2: 'C3', C_gamma_1: 'C3', C_beta: 'CH', }
