    New chain ID            Original chain ID

8ip9-pdb-bundle1.pdb:
           A                        aa
           B                        ba
           C                        ca
           D                        da
           E                        ga
           F                        ha
           G                        ia
           H                        ja
           I                        ka
           J                        la
           K                        ma
           L                        na
           M                        oa
           N                        pa
           O                        qa
           P                        ra
           Q                        sa
           R                        ta
           S                        ua
           T                        va
           U                        wa
           V                        xa
           W                        ya
           X                        za
           Y                        bb
           Z                        cb
           a                        db
           b                        eb
           c                        fb
           d                        gb
           e                        hb
           f                        ib
           g                        IB
           h                        al
           i                        cl
