    New chain ID            Original chain ID

9wbg-pdb-bundle1.pdb:
           f                         f
           C                         C
           D                         D
           V                         V
           W                         W
           X                         X
           Y                         Y
           Z                         Z
           a                         a
           b                         b
           d                         d
           e                         e
           v                         v
           U                         U
           c                         c
           A                         A
           B                         B
           E                         E
           F                         F
           w                         w
