    New chain ID            Original chain ID

9rhl-pdb-bundle1.pdb:
           2                         2
           3                         3
           4                         4
           5                         5
           6                         6
           7                         7
           H                         H
           I                         I
           a                         a
           b                         b
           c                         c
           d                         d
           e                         e
           f                         f
           X                         X
           Y                         Y
