    New chain ID            Original chain ID

7ogu-pdb-bundle1.pdb:
           A                       AAA
           B                       BBB
           C                       CCC
           D                       DDD
           E                       EEE
           F                       FFF
           G                       GGG
           H                       HHH
           I                       III
           J                       JJJ
           K                       KKK
           L                       LLL
           M                       AaA
           N                       AcA
           O                       AhA
           P                       AlA
           Q                       AnA
           R                       AqA
           S                       AsA
           T                       BaB
           U                       DaD
           V                       DeD
           W                       DgD
           X                       DiD
           Y                       DmD
           Z                       DpD
           a                       EaE
           b                       EdE
           c                       GaG
           d                       GdG
           e                       GgG
           f                       GjG
           g                       GlG
           h                       GnG
           i                       HaH
           j                       JaJ
           k                       JcJ
           l                       JeJ
           m                       JgJ
           n                       JkJ
           o                       KaK
