    New chain ID            Original chain ID

7qij-pdb-bundle1.pdb:
           A                        AA
           B                        BA
           C                        CA
           D                        DA
           E                        EA
           F                        FA
           G                        GA
           H                        HA
           I                        IA
           J                        JA
           K                        KA
           L                        LA
           M                        MA
           N                        NA
           O                        OA
           P                        PA
           Q                        QA
           R                        RA
           S                        CB
           T                        CC
           U                        JB
           V                        JC
           W                        KB
           X                        KC
           Y                        RB
           Z                        RC
           a                        GB
           b                        GC
           c                        LB
           d                        LC
           e                        NB
           f                        NC
           g                        OB
           h                        OC
           i                        PB
           j                        PC
           k                        EB
           l                        EC
           m                        FB
           n                        FC
           o                        HB
           p                        HC
           q                        IB
           r                        IC
           s                        AB
           t                        AC
           u                        BB
           v                        BC
           w                        DB
           x                        DC
           y                        MB
           z                        MC
           0                        QB
           1                        QC
