    New chain ID            Original chain ID

7une-pdb-bundle1.pdb:
           L                         L
           D                         D
           U                         U
           d                         d
           M                         M
           N                         N
           Q                         Q
           O                         O
           P                         P
           b                         b
           c                         c
           g                         g
           e                         e
           f                         f
