    New chain ID            Original chain ID

8an2-pdb-bundle1.pdb:
           A                       AAA
           B                       BBB
           C                         A
           D                         B
           E                         C
           F                         D
           G                         E
           H                         F
           I                         G
           J                         H
           K                         I
           L                         J
           M                         K
           N                         L
           O                         M
           P                         N
           Q                         O
