    New chain ID            Original chain ID

7eto-pdb-bundle1.pdb:
           x                         x
           h                         h
           I                         I
           H                         H
           P                         P
           n                         n
           o                         o
           g                         g
           m                         m
           M                         M
           N                         N
           O                         O
           1                         1
           Q                         Q
           R                         R
           S                         S
           T                         T
           i                         i
           j                         j
           a                         a
           A                         A
           B                         B
           C                         C
           D                         D
           Y                         Y
           Z                         Z
