    New chain ID            Original chain ID

7zqc-pdb-bundle1.pdb:
           A                         A
           B                         B
           C                         C
           D                         D
           E                         E
           F                         F
           G                         G
           I                         I
           J                         J
           L                         L
           K                         K
           1                         1
           3                         3
           7                         7
           8                         8
           Z                         Z
           4                         4
           5                         5
           6                         6

7zqc-pdb-bundle2.pdb:
           9                         9
           H                         H
