    New chain ID            Original chain ID

6n30-pdb-bundle1.pdb:
           A                        b2
           B                        b1
           C                         a
           D                        c3
           E                        c4
           F                        c5
           G                        c6
           H                        c7
           I                        c8
           J                        c9
           K                        c0
           L                        c1
           M                        c2
           N                         C
           O                         A
           P                         B
           Q                         F
           R                         D
           S                         E
           T                         G
           U                         H
           V                         I
