    New chain ID            Original chain ID

8i9p-pdb-bundle1.pdb:
           A                        C1
           B                        C2
           C                        CA
           D                        CB
           E                        CC
           F                        CE
           G                        CI
           H                        CJ
           I                        CM
           J                        CR
           K                        CU
           L                        LC
           M                        LE
           N                        LF
           O                        LG
           P                        LL
           Q                        LM
           R                        LN
           S                        LO
           T                        LP
           U                        LQ
           V                        LS
           W                        LT
           X                        LX
           Y                        LY
           Z                        Le
           a                        Lf
           b                        Lh
           c                        Li
           d                        Lj
           e                        Cc
           f                        Cd
           g                        Ce
