    New chain ID            Original chain ID

4v92-pdb-bundle1.pdb:
           A                        A2
           B                        AZ
           C                        BA
           D                        BB
           E                        BC
           F                        BD
           G                        BE
           H                        BF
           I                        BG
           J                        BH
           K                        BI
           L                        BJ
           M                        BK
           N                        BL
           O                        BM
           P                        BN
           Q                        BO
           R                        BP
           S                        BQ
           T                        BR
           U                        BS
           V                        BT
           W                        BU
           X                        BV
           Y                        BW
           Z                        BX
           a                        BY
           b                        BZ
           c                        Ba
           d                        Bb
           e                        Bc
           f                        Bd
           g                        Be
           h                        Bf
           i                        Bg
