    New chain ID            Original chain ID

6mzu-pdb-bundle1.pdb:
           A                         A
           B                         B
           C                         C
           D                         D
           E                         E
           F                         F
           G                        GA
           H                        GB
           I                        GC
           J                        GD
           K                        GE
           L                        GF
           M                        HA
           N                        HB
           O                        HC
           P                        HD
           Q                        HE
           R                        HF
           S                        IA
           T                        IB
           U                        IC
           V                        ID
           W                        IE
           X                        IF
           Y                        JA
           Z                        JB
           a                        JC
           b                        JD
           c                        JE
           d                        JF
           e                        KA
           f                        KB
           g                        KC
           h                        KD
           i                        KE
           j                        KF
           k                        LA
           l                        LB
           m                        LC
           n                        LD
           o                        LE
           p                        LF
