    New chain ID            Original chain ID

9i4y-pdb-bundle1.pdb:
           A                        4B
           B                        4C
           C                        4D
           D                        4E
           E                        4F
           F                        4G
           G                        4H
           H                        4I
           I                        4J
           J                        4K
           K                        4L
           L                        4M
           M                        4N
           N                        4O
           O                        4P
           P                        4Q
           Q                        4R
           R                        4S
           S                        4T
           T                        4U
           U                        4V
           V                        4W
           W                        4X
           X                        4Y
           Y                         B
