N = Atom('N')
H_1 = Atom('H')
H_2 = Atom('H')
bonds = [Bond(N,H_1), Bond(N,H_2), ]
name = 'amide'
symbol = 'Nhe'
pdbmap = [('NHE', {'N': N, 'HN1': H_1, 'HN2': H_2,  }, ), ]
opls_atom_type = {N: 'N2', H_1: 'H2', H_2: 'H2',  }
opls_charge = {N: -0.463, H_1: 0.2315, H_2: 0.2315,  }
chain_links = [N,None]
