    New chain ID            Original chain ID

6zlo-pdb-bundle1.pdb:
           A                         A
           B                         B
           C                         C
           D                         D
           E                         E
           F                         F
           G                         G
           H                         H
           I                         I
           J                         J
           K                         K
           L                         L
           M                         M
           N                         N
           O                         O
           P                         P
           Q                         Q
           R                         R
           S                         S
           T                         T
           U                         V
           V                         W
           W                         X
           X                         Y
           Y                         Z
           Z                        AA
           a                        BA
           b                        CA
           c                        DA
           d                        EA
           e                        FA
           f                        GA
           g                        HA
           h                        IA
           i                        JA
           j                        KA
           k                        LA
           l                        MA
           m                        NA
           n                        OA
           o                        PA
           p                        QA
           q                        RA
           r                        SA
           s                        TA
           t                        UA
           u                        VA
           v                        WA
           w                        XA
           x                        YA
           y                        ZA
           z                        AB
           0                        BB
           1                        CB
           2                        DB
           3                        EB
           4                        FB

6zlo-pdb-bundle2.pdb:
           A                        GB
           B                        HB
           C                        IB
