    New chain ID            Original chain ID

9p4w-pdb-bundle1.pdb:
           A                         A
           B                         B
           D                         D
           E                         E
           H                         H
           I                         I
           K                         K

9p4w-pdb-bundle2.pdb:
           L                         L
           N                         N
           O                         O
           Q                         Q
           R                         R
