    New chain ID            Original chain ID

7zqd-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

7zqd-pdb-bundle2.pdb:
           A                         9
           B                        A2
           C                        B2
           D                        C2
           E                        D2
           F                        E2
           G                        F2
           H                        G2
           I                        I2
           J                        J2
           K                        L2
           L                        K2
           M                        12
           N                        32
           O                        72
           P                        82
           Q                        Z2
           R                        42
           S                        52

7zqd-pdb-bundle3.pdb:
           A                        62
           B                        92
           C                         H
