    New chain ID            Original chain ID

6n2z-pdb-bundle1.pdb:
           A                        b2
           B                        b1
           C                         a
           D                        c7
           E                        c8
           F                        c9
           G                        c0
           H                        c1
           I                        c2
           J                        c3
           K                        c4
           L                        c5
           M                        c6
           N                         B
           O                         C
           P                         A
           Q                         E
           R                         F
           S                         D
           T                         G
           U                         H
           V                         I
