    New chain ID            Original chain ID

6zwv-pdb-bundle1.pdb:
           A                         A
           B                         B
           C                         C
           D                         F
           E                         Q
           F                         S
           G                         V
           H                         X
           I                         b
           J                         k
           K                         m
           L                         p
           M                         r
           N                         v
           O                         4
           P                         6
           Q                         9
           R                        BA
