    New chain ID            Original chain ID

7yiw-pdb-bundle1.pdb:
           A                         A
           B                         D
           C                         C
           D                         B
           E                         G
           F                         H
           G                         F
           H                         E
           I                         K
           J                         N
           K                         U
           L                         X
           M                         e
           N                         h
           O                         o
           P                         r
           Q                         y
           R                         1
           S                         8
           T                        BA
           U                        IA
           V                        LA
           W                        SA
           X                        VA
