    New chain ID            Original chain ID

7scc-pdb-bundle1.pdb:
           A                        AA
           B                        AB
           C                        AC
           D                        AD
           E                        AE
           F                        AF
           G                        AH
           H                        AI
           I                        AJ
           J                        AK
           K                        AL
           L                        AM
           M                        AO
           N                        AQ
           O                        AS
           P                        AT
           Q                        AU
           R                        AV
           S                        AW
           T                        AX
           U                        AY
           V                        AZ
           W                        BA
           X                        BB
           Y                        BD
           Z                        BE
           a                        BF
           b                        BG
           c                        BH
           d                        BI
           e                        BK
           f                        BM
           g                        BO
           h                        BP
           i                        BQ
           j                        BR
