    New chain ID            Original chain ID

8i9x-pdb-bundle1.pdb:
           A                        C1
           B                        C2
           C                        CA
           D                        CB
           E                        CC
           F                        CD
           G                        CE
           H                        CF
           I                        CG
           J                        CH
           K                        CI
           L                        CJ
           M                        CK
           N                        CL
           O                        CM
           P                        CN

8i9x-pdb-bundle2.pdb:
           A                        CO
           B                        CP
           C                        CQ
           D                        CR
           E                        CS
           F                        CT
           G                        CU
           H                        CV
           I                        CX
           J                        CY
           K                        Cb
           L                        Cz
           M                        LB
           N                        LC
           O                        LE
           P                        LF
           Q                        LG
           R                        LH
           S                        LK
           T                        LL
           U                        LM
           V                        LN
           W                        LO
           X                        LP
           Y                        LQ
           Z                        LR
           a                        LS
           b                        LT
           c                        LU
           d                        LV
           e                        LX
           f                        LY
           g                        LZ
           h                        Lc
           i                        Ld
           j                        Le
           k                        Lf
           l                        Lg
           m                        Lh
           n                        Li
           o                        Lj
           p                        Lk
           q                        Ll
           r                        Lq
